I believe I'm missing something simple, I even copied his code and keep getting the same result. Questions not listing

var questions = [
  ['How many states are in the United States?', 50],
  ['How many continents are there?', 7],
  ['How many legs does an insect have?', 6]
];
var correctAnswers = 0;
var question;
var answer;
var response;
var correct = [];
var wrong = [];

function print(message) {
  var outputDiv = document.getElementById('output');
  outputDiv.innerHTML = message;
}

function buildList(arr) {
  var listHTML = '<ol>';
  for (var i = 0; i < arr.length; i += 1) {
  listHTML += '<li>' + arr[i] + '</li>';
  }
  listHTML += '</ol>';
}

for (var i = 0; i < questions.length; i += 1) {
  question = questions[i][0];
  answer = questions[i][1];
  response = prompt(question);
  response = parseInt(response);
  if (response === answer) {
    correctAnswers += 1;
    correct.push(question);
  } else {
    wrong.push(question);
  }    
}

html = "You got " + correctAnswers + " question(s) right."
html += "<h2>These are the question(s) you got correct.</h2>";
html += buildList(correct);
html += "<h2>These are the question(s) you got wrong.</h2>";
html += buildList(wrong);
print(html);