in case you don't have only 3 questions, this fiddle will do the thing you want for any number of questions (for example 5 questions).
jquery :
$(document).ready(function(){
$('div.content:first-child').fadeIn();
$('.choice').click(function (){
var $thisParent = $(this).closest('div.content');
$thisParent.fadeOut(1000, function(){
$thisParent.next('.content').fadeIn();
});
});
});
note that the CSS is changed as well.
EDIT: to show something after the last question, you can use this updated fiddle