<ol>
<li>When the Vietnam War, one of the most controversial wars in history, led to an escalation of the military draft, thousands of students gathered in large cities (to protest it).</li>
</ol>
<p>Correct answer is c. to protest</p>
<p>why?</p>
<p>meaning “to protest” is wrong? Well if it’s “to protest it”, it seems kind of vague</p>
<p>The fact is that “it” could refer to either the draft or the war. Therefore, it is ambiguous and wrong.</p>
<p>actually, according to my book, its apparently redundant. i think that the it, in its context simply refers to the draft.</p>
<p>yeah. When the Vietnam war escalated into a draft, thousands of students gathered in large cities to protest. <- That sentence is correct</p>