<p>ImageShack®</a>; - Online Photo and Video Hosting</p>
<p>What is the answer, and why? thanks so much!</p>
<p>E just cuz it uses “it” as a pronoun but also cuz of the modifier</p>
<p>I thought it was A because it modifies industrial pollution</p>
<p>Nevermind. E does work best. </p>
<p>The agency is the one reducing the levels. The agency then refers back to itself.</p>