JSFiddle - React, Tailwind, and code Playground

HTML

<div id="extendedResponse" align="left">
            <form action="">
                <div name="extendedStayResponses">
                    <input type="checkbox" name="extendedStay" id="extendedStay"/>Yes
                </div>
                <div id="extendedQuarter" style="display:none">
                    <select name="extraQuarters" selected="1">
                        <option value="1">1</option>
                        <option value="2">2</option>
                        <option value="3">3</option>
                        <option value="4">4</option>
                        <option value="5">5</option>
                        <option value="6">6</option>
                        <option value="7">7</option>
                        <option value="8">8</option>
                        <option value="9">9</option>
                        <option value="10">10</option>
                    </select>
                </div>
            </form>
    </div>

JavaScript

$('#extendedStay').click(function(){
            $('#extendedQuarter').toggle(this.checked);
        });