Wrap Radio Buttons in a fieldset Element for Better Accessibility

Summary

The fieldset tag surrounds the entire grouping of a radio button to show the choices that are a part of a set.
The legend tag provides a description for the grouping.

Final Code

<body>
  <header>
    <h1>Deep Thoughts with Master Camper Cat</h1>
  </header>
  <section>
    <form>
      <p>Sign up to receive Camper Cat's blog posts by email here!</p>
      <label for="email">Email:</label>
      <input type="text" id="email" name="email">


      <!-- Only change code below this line -->
      <fieldset>
        <legend>What level ninja are you?</legend>
        <input id="newbie" type="radio" name="levels" value="newbie">
        <label for="newbie">Newbie Kitten</label><br>
        <input id="intermediate" type="radio" name="levels" value="intermediate">
        <label for="intermediate">Developing Student</label><br>
        <input id="master" type="radio" name="levels" value="master">
        <label for="master">Master</label>
      </fieldset>
      <!-- Only change code above this line -->


      <input type="submit" name="submit" value="Submit">
    </form>
  </section>
  <article>
    <h2>The Garfield Files: Lasagna as Training Fuel?</h2>
    <p>The internet is littered with varying opinions...</p>
  </article>
  <img src="samuraiSwords.jpeg" alt="">
  <article>
    <h2>Defeating your Foe: the Red Dot is Ours!</h2>
    <p>Felines the world over have been waging war...</p>
  </article>
  <img src="samuraiSwords.jpeg" alt="">
  <article>
    <h2>Is Chuck Norris a Cat Person?</h2>
    <p>Chuck Norris is widely regarded as the...</p>
  </article>
  <footer>&copy; 2018 Camper Cat</footer>
</body>