Hey Atul,
Wow, great catch there...you're 100% correct that "the monkey uses his intelligence to create an insecticide" is illogical - the sentence needs to set up a metaphor (it's like he's creating an insecticide) as choice E does.
Really good catch - I was looking at the fact that C corrected the error that I saw in D, but C introduced a whole new one (in addition to the parallelism error).
I'm psyched to see you paying attention to that logic - really well-written questions will often have those logical problems in them, so if you're looking for that it adds a big dimension to your ability to solve these.
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Mundasingh - good point on that singular "its" after the underline to hammer home the importance of a singular noun "Capuchin". I'm just about certain that some cases similar to your examples (maybe "the Chicago Bulls are one of the most recognizable teams in the world") would be grammatically okay, but I'm even more confident that one of your greatest advantages on GMAT SC is that you only have to recognize differences between answer choices. In this case, I don't think you could correctly say that "The Capuchins are one of the most intelligent monkeys" (because Capuchins are monkeys...that would be like saying "the three brothers are one of the wealthiest men"), but you could probably say that "The Capuchins are one of the most intelligent species". (because Capuchins only encompass one species). But since this question looks to require a direct decision between singular and plural, it's a quicker decision - "Capuchin" (singular) doesn't introduce any problems with "one" as a modifier, so you can't eliminate it, but "Capuchins" (plural) is suspect at best. And if that's the decision point you see left, "suspect" is as good as "definitely wrong" if the other remaining choice looks flawless.
Brian Galvin
GMAT Instructor
Chief Academic Officer
Veritas Prep
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