JSFiddle - React, Tailwind, and code Playground

HTML

<td colspan="4">
    <input name="discount" type="radio" id="Yes" value="Yes" />Yes
    <input name="discount" type="radio" id="No" value="No" checked="checked" />No<br />  
    <select class="purple" name="discountselection" id="discountselection" disabled>
        <option value="1 Year" selected="selected">1 Year</option>
        <option value="2 Years">2 Years</option>
        <option value="3 Years">3 Years</option>
    </select>                  
</td>

JavaScript

$('#discountselection').hide();

$('#No').click(function() {
    $('#discountselection').hide();
});

$('#Yes').click(function() {
    $('#discountselection').show();
    $('#discountselection').removeAttr('disabled');
});