WR Questions! Please help :)

<ol>
<li>For many, the game of Scrabble is no mere pastime: highly skilled players participate in tournaments every bit as intense as [competing chess masters].</li>
</ol>

<p>(A) competing chess masters
(B) those in which chess masters compete
(C) when chess masters compete
(D) they were when chess masters compete
(E) if chess masters were competing</p>

<p>Answer: B
I definitely know why c, d, and e are wrong but as for A and B I don’t have a clue. For one the correct answer B is not even parallel to “highly skilled players participate in tournaments”. Please help :(</p>

<ol>
<li>[Although raining], everyone who [had come] to the premiere of the new film [was] determined to remain in the long line [rather than] go home. [No error]</li>
</ol>

<p>Answer: Although raining
Is raining supposed to be “it was raining” or “it had been raining”?</p>

<ol>
<li>Genetic engineering of plants, which has both opponents and proponents, may help improve drought tolerance in vegetables, [a development that could increase crop yields]. </li>
</ol>

<p>(A) a development that could increase crop yields
(B) and that could help the increase of crop yields
(C) which would help for increasing crop yields
(D) helping to increase, with this development, the yields of crops
(E) as such a development would help increase the yields of crops</p>

<p>Answer: A
D and E were just so wordy that I immediately crossed them out. I’m guessing B and C have ambiguous “that” and “which”, respectively but not 100% sure. Is my reasoning correct?</p>

<ol>
<li>Faulty comparison here … The question refers to how ‘intense’ the ‘tournament’ is in which scrabble players compete </li>
</ol>

<p>So basically it says … The tournament in which scrabble players compete is just as intense as the tournament in which chess masters compete </p>

<p>Thus, the answer is B. In any case, A will sound very funny when you say it in your head</p>

<ol>
<li>‘It was raining’ would be correct as that would imply that it was raining while the people stood in line </li>
</ol>

<p>On the other hand, ‘it had been raining’ implies that it was the rainy season or it had rained previously in the day rather than the fact that it was raining while people stood in line </p>

<ol>
<li>Yep your reasoning is correct and C does not make sense anyways </li>
</ol>

<p>I really hope this helped and I did not confuse you further … Struggling to find the right words in my explanations :/</p>

<p>@Alcaraz Thanks a ton.
Btw, is it possible to replace “in which” with “where”?</p>

<p>Hmm not really sure … Could you give me a possible sentence where you are thinking of doing so?</p>

<p>usually in which and where can be used interchangeably both are grammatically correct.
However please do give an example so I can be certain that in that example it is possible</p>