JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div class="dv1">
      <span correct="sp1"> D </span>
      <span correct="sp2"> C </span>
      <span correct="sp3"> Z </span>
 </div>

CSS

.active{
  background: red;
}

JavaScript

$(".dv1").find('span[correct=sp2]').addClass("active");