LINQ Sort with MaxDate child record

I have a developed a CRM application that includes Clients, Contacts and Activities.  An Activity is when a Salesperson interacts with a Client.  Activity records have a date property.  I have successfully written a linq query that retrieves all Clients and a single corresponding Activity record, if there is one, which is the most recent Activity, by the ActivityDate property.  However, I cannot get the query to sort by the ClientName property.

Here is the linq code:
-------------------------------------------
public ViewResult ComplianceIndex(string city, string status, string salesperson)
        {

            var entities = from c in db.Clients where c.Salesperson == salesperson && c.Status == status && c.City == city
                           join a in db.Activities on c.ClientID equals a.ClientID
                           into temp
                           
                           from t in temp.OrderByDescending(a => a.ActivityDate).Take(1).DefaultIfEmpty()
                           select new ClientMaxActivityViewModel { clientData = c, activityData = t };
           
            return View("ComplianceIndex",entities);
        }
------------------------------------------

Here is the data returned:


Here is the Client entity:
-------------------------------------
public class Client
    {
        private const bool Default_Active = true;
       
        [Key]
        [HiddenInput(DisplayValue = false)]
        public int ClientID { get; set; }
        [Display(Name = "Client Name")]
        [Required(ErrorMessage = "Please enter a Client Name")]
        [StringLength(120, ErrorMessage = "Please enter 120 characters or less")]
        public string ClientName { get; set; }
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        public string Specialty { get; set; }
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        public string Street { get; set; }
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        public string Suite { get; set; }
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        [Required(ErrorMessage="Please enter a City for this client")]
        public string City { get; set; }
        [StringLength(2, ErrorMessage = "Please enter 2 characters")]
        public string State { get; set; }
        [StringLength(10, ErrorMessage = "Please enter 10 characters or less")]
        public string ZipCode { get; set; }
        [StringLength(20, ErrorMessage = "Please enter 20 characters or less")]
        public string Telephone { get; set; }
        [StringLength(20, ErrorMessage = "Please enter 20 characters or less")]
        public string FAX { get; set; }
        [Display(Name = "Visit Frequency")]
        [Required(ErrorMessage = "Please enter a Visit Frequency")]
        public string VisitFrequency { get; set; }
        [Display(Name = "Primary Pathologist")]
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        public string PrimaryPathologistName { get; set; }
        [Display(Name = "Images in Reports")]
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        public string ImagesInReports { get; set; }
        [Display(Name = "Report Delivery")]
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        public string ReportDelivery { get; set; }
        [Display(Name = "Clinical Testing")]
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        public string ClinicalTesting { get; set; }
        [Display(Name = "Special Note")]
        [DataType(DataType.MultilineText)]
        [StringLength(150, ErrorMessage="Please enter 150 characters or less")]
        public string SpecialNote { get; set; }
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        public string EMR { get; set; }
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        public string PAL { get; set; }
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        [Display(Name="PRL Staff")]
        [Required(ErrorMessage="Please enter a PRL Staffer (salesperson)")]
        public string Salesperson { get; set; }
        [Display(Name = "Acct Mgr")]
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        [Required(ErrorMessage="Please enter an Account Manager")]
        public string AccountManager { get; set; }
        public string Status { get; set; }
        public bool Active { get; set; }

        public string CreatedBy { get; set; }
        [DisplayFormat(DataFormatString = "{0:d}")]
        public DateTime RecordDate { get; set; }

        public virtual ICollection<ClientPersonnel> ClientPersonnels { get; set; }
        public virtual ICollection<Activity> Activities { get; set; }

    }

And the Activity entity:
-----------------------------------------
public class Activity
    {
        [Key]
        [HiddenInput(DisplayValue = false)]
        public int ActivityID { get; set; }
        [HiddenInput(DisplayValue = false)]
        public int ClientID { get; set; }
        [Display(Name = "Salesperson")]
        [Required(ErrorMessage = "Please enter a Salesperson")]
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        public string SalespersonName { get; set; }
        [Display(Name = "Activity Contact")]
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        public string PrimaryClientActivityContact { get; set; }
        [Display(Name = "Activity Type")]
        [Required(ErrorMessage = "Please enter an Activity Type")]
        [StringLength(50, ErrorMessage = "Please enter 50 characters or less")]
        public string ActivityType { get; set; }
        [DataType(DataType.DateTime)]
        [DisplayFormat(DataFormatString = "{0:MM-dd-yyyy}", ApplyFormatInEditMode = true)]
        [Required(ErrorMessage = "Please enter an Activity Date")]
        [Display(Name = "Activity Date")]
        public DateTime ActivityDate { get; set; }

        [DataType(DataType.Text)]
        [Required(ErrorMessage = "Please enter an Activity Time")]
        [Display(Name = "Activity Time")]
        public String ActivityTime { get; set; }

        [Display(Name = "Expense")]
        [DisplayFormat(DataFormatString = "{0:C}", ApplyFormatInEditMode = false)]
        public decimal ExpenseAmount { get; set; }

        [DataType(DataType.MultilineText)]
        [Required(ErrorMessage = "Please enter a Note")]
        public string Note { get; set; }

        public virtual Client Client { get; set; }

       
    }
------------------------------------------------

Here is the ViewModel:
-------------------------------------
public class ClientMaxActivityViewModel
    {
        public Client clientData { get; set; }
        public Activity activityData { get; set; }
    }