JSFiddle - React, Tailwind, and code Playground

HTML

<div id="question-1" class="top-question">
    What do you want?<br>
    <select>
        <option value='thing'>thing</option>
        <option value='item'>item</option>
    </select>
    <div id="question-1a" class="sub-question">
        How many of them?<br>
        <select>
            <option value='5'>five</option>
            <option value='10'>ten</option>
        </select>
    </div>
</div>

JavaScript

$('.sub-question').hide()
$('.top-question').bind('change',function(){
    $('.sub-question').show()
})