I copied the code line for line from the video, but the questions are still not listed. What am I missing?

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 html;

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>";          //   it should be listHTML += "</ol>"
  return listHTML;
}

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>You got these questions correct:</h2>";
html += buildList(correct);
html += "<h2>You got these questions incorrect:</h2>";
html += buildList(wrong);

print(html);