JSFiddle - React, Tailwind, and code Playground
HTML
<input type="radio" name="answer" value="A" />
<input type="radio" name="answer" value="B" />
<input type="radio" name="answer" value="C" />
<input type="radio" name="answer" value="D" />
JavaScript
$('input[name="answer"]').filter("[value='C']").attr("checked", true);