<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div class="container">
<h1>Lare Image Activity</h1>
<div class="row">
<div class="col-md-12">
<img class="visible-lg" src="http://i.imgur.com/oqwCc1q.jpg" alt="" title="File size= 750KB">
<img class="visible-md" src="http://i.imgur.com/8xuO9uE.jpg" alt="" title="File size= 355KB">
<img class="visible-sm" src="http://i.imgur.com/0JHR7Kg.jpg" alt="" title="File size= 239KB">
<img class="visible-xs" src="http://i.imgur.com/d3sRBkd.jpg" alt="" title="File size= 55KB">
</div>
</div>
</div>
