How to improve this code?

//My code
var quizLines = [
  ['What is this browser?', 'chrome'],
  ['What is the color of water?', 'blue'],
  ['What is the color of the sky?', 'blue']
];
var quizRight = [];
var quizWrong =[];
var questionsR;
var numCorrect = 0;
var html;
var rightMessage;
//Display messages
function print(message) {
  document.write(message);
};

function printR() {
  document.write('<p>You got these correct.</p>');
  document.write('<p>'+ quizRight.join('<p> ') + '</p>');
};

function printW() {
  document.write('<p>You got these wrong.</p>');
  document.write('<p>'+ quizWrong.join('<p> ') + '</p>');
};


// Loop
for (var i = 0; i <=2 ; i += 1) {

  //Question loop
  var sAnswer = prompt( quizLines[i][0] );
  sAnswer = sAnswer.toLowerCase();
  var correctA = quizLines[i][1];

  //Correct counter
  if (sAnswer === correctA) {
    numCorrect += 1;
    quizRight.push(quizLines[i][0]);
  } else {
    quizWrong.push(quizLines[i][0]);
  }
};
html = "<p>You got " + numCorrect + " question(s) right.</p>"
print(html);
printR();
printW();