Question from the HTML5/CSS3 test

Which statements are true regarding the image management on this web page?

<h1>Latest news</h1>
 
<nav>
    <ul>
        <li><a href="/economy"><img src="icon-economy.jpg" alt=""></a></li>
        <li><a href="/politics"><img src="icon-politics.jpg" alt=""></a></li>
        <li><a href="/social"><img src="icon-social.jpg" alt=""></a></li>
        <li><a href="/entertainment"><img src="icon-entertainment.jpg" alt=""></a></li>
    </ul>
</nav>
 
<main>
    <article>
        <h2><img src="icon-blog-large.jpg" alt=""> Should Brussels host Edward Snowden?</h2>
 
        <img src="article-id-1337-cover.png" width="600" height="250" class="article-cover" style="float:left">
 
        <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. At, recusandae! Molestiae quisquam voluptates ad similique a blanditiis eligendi, maiores sapiente vitae ipsam illum alias, accusamus, accusantium iste ipsa magnam sunt exercitationem eum. Aliquid suscipit ea vero vel! Rerum reiciendis assumenda fugit quisquam porro reprehenderit quidem, esse corporis provident repudiandae!</p>
    </article>
</main>