multiple choice quiz

custom.js

'use strict'

const firstQuestion = document.getElementById('first-question')
const answers = firstQuestion.querySelectorAll('input')
const submit = document.getElementById('submit')
const result = document.getElementById('result')

for (let i = 0; i < answers.length; i++) {
  answers[i].addEventListener('click', selectAnswer)
}

function selectAnswer () {
  // Reset checkboxes to unchecked
  for (let i = 0; i < answers.length; i++) {
    answers[i].checked = false
  }
  this.checked = true
}

submit.addEventListener('click', checkAnswer)

function checkAnswer () {
  for (let i = 0; i < answers.length; i++) {
    if (answers[i].id === 'b') {
      if (answers[i].checked === true) {
        result.innerHTML = 'Correct!'
      } else {
        result.innerHTML = 'Wrong!'
      }
    }
  }
}

index.html

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>Multiple Choice Quiz</title>
  <meta name="robots" content="noindex, nofollow">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="styles.css">
</head>

<body>
  <header>
    <h1>Site Name</h1>
  </header>
  <div class="wrapper">
    <div class="container">
      <p>Which artist uses pollen collected from flowers to create art?</p>
      <div id="first-question">
        <label for="a">Richard Long</label>
        <input id="a" name="a" type="checkbox">
        <label for="b">Wolfgang Laib</label>
        <input id="b" name="b" type="checkbox">
        <label for="c">Andy Goldsworthy</label>
        <input id="c" name="c" type="checkbox">
      </div>
      <p id="result"></p>
      <button id="submit">Submit</button>
    </div>
    <!-- .container-->
  </div>
  <!-- .wrapper-->
  <footer>
    <small><a href="https://opensource.org/licenses/MIT">MIT</a></small>
  </footer>
  <script src="custom.js"></script>
</body>

</html>

styles.css

body {
  background: #eeeeee;
  font-size: 16px;
  font-family: "Trebuchet MS", Helvetica, sans-serif;
  margin: 0;
}

a {
  color: crimson;
  text-decoration: none;
}

a:hover {
  color: red;
}


/* Layout
------------------------------------------*/

header,
.container,
footer {
  margin: 0 auto;
  width: 88%;
  max-width: 1080px;
}

.wrapper {
  padding: 1em 0;
  background: #ffffff;
}