Get Text of Select using class name ***JavaScript Only***

How do I get the selected text (not value) of a select element based on the class name? JS only please!

<select class="stateSelectorDropdown">  
            <option>Change State</option>                  
                <option>Arizona</option>
                <option>California</option>
                <option>Colorado</option>
                <option>Idaho</option>
                <option>Iowa</option>
                <option>Kansas</option>
                <option>Minnesota</option>
                <option>Missouri</option>
                <option>Nebraska</option>
                <option>Nevada</option>
                <option>New Mexico</option>
                <option>North Dakota</option>
                <option>Oklahoma</option>
                <option>Oregon</option>
                <option>South Dakota</option>
                <option>Utah</option>
                <option>Washington</option>
                <option>Wisconsin</option>
                <option>Wyoming</option>
            </select>

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