<ol>
<li>Among the most flavorful cuisines in the United States, (New Orleans has also become) one of the most popular.</li>
</ol>
<p>(A) New Orleans has also become
(B) New Orleans has also become famous as
(C) the cuisine of New Orleans is also
(D) cuisines in New Orleans also have become
(E) also the cuisine of New Orleans is</p>
<p>I put D but its C, why?</p>
<ol>
<li>Born of Ibuza parents in Nigeria, novelist Buchi Emecheta moved to England in (1962, since which she has lived in North London).</li>
</ol>
<p>(A) 1962, since which she has lived in North London
(B) 1962 and has lived since then in North London
(C) 1962, since then she has lived in North London
(D) 1962 and lived since then in North London
(E) 1962, and living in North London since that time</p>
<ol>
<li><p>By using D, you are saying that the cuisines “also have become one of the most popular”. You are using a plural noun (cuisines) but saying that they “have become one of”, which sounds singular. By using C, you are using a singular noun with a singular expression, which is proper.</p></li>
<li><p>The only difference between D and B are the tenses of the verbs. B suggests that Emecheta has been living since then in London and still is now, which seems correct. D on the other hand is saying that the guy lived after that in London but finished living in London, which is unclear. (It’s using the past perfect tense, which suggests completion of an action, whereas the other one does not suggest that.)</p></li>
</ol>