<p>Well, I suppose my logic (whether correct or not) would be that rearranging the words in the subject without changing the meaning would be ok, so changing "The first people" to "The people who were first ________ North America" doesn't change any meaning makes the answer clearly D. Even without thinking that though, I would think "first to" would be the idea I was looking for"</p>
<h2>I got C, as it immediately corrects the pronoun error in the original sentence without changing the meaning of the sentence. Although, D looked good as well. I'll have to keep thinking about that one.</h2>
<p>I believe it is idomatic to say "to have a debate on the topic of [something]", though I prefer "to have a debate about [something]".</p>
<p>It isn't B, as using which is just bizarre, and it isn't E, as then the second part of the sentence would be "had done so". I doubt it is the same, as using that is awkward, so it's either D or C.</p>
<p>bigmrpig , I don't know where you got the idea to rephrase it and include a "who" that was never in the original sentence. Somebody can give a grammatical explanation for this most likely, but "to reach" sounds awkard. I think it's the wrong tense.</p>
<p>Yeah my way makes no sense, but I still see no reason why it wouldn't be D...</p>
<p>"First people who reached" doesn't sense because it makes "first" and "who reached" have no word to relate them to each other. Instead of "first," any adjective could be used. "The European people who reached," for example. If you use "who reached," then that wouldn't match up with "first," it would just be a separate description. It makes the term "first" ambiguous, because it is never specified what they were first to do. "First people to reach" is the only one that specifies what they were first to do.</p>
<p>So to reiterate, my argument is that "The first people who reached" provides two separate pieces of information about people, a description before and a description after, while the goal of the phrase is to provide a single piece of information, that information being that the people were first to reach North America.</p>
<p>The fact that the word "first" can be any adjective in the phrase "The first people who reached North America" without making the sentence grammatically incorrect shows that the words "first" and "who reached North America" are independent of each other. Either one can even be removed and the sentence remains grammatically correct. In the phrase "The first people to reach North America," the words "first" and "to reach North America" are directly related. Together they form one piece of information, instead of two.</p>
<p>Ah, the answer is C and I don't have the PR explanations. When I took it, I chose D using the same reasoning bigmrpig used. Why does choice D not work?</p>