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daagh
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gmatter0913 : The word "only" was present in the original sentence (i.e question), so one should try not to omit any of the original words.
Also you may have noticed a phrase "choice few behavioral scientists" that demands the presence of word "only"

Hope its clear..
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What is 'choice few behavioural scientists'?I've come across this kind of usage for the first time.
Shouldn't it be 'chosen few' as in the original sentence?
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choice few ?? Are sure there is no typo there, because it completely threw me off.
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Yes, Couldn't understand "choice few behavioural scientists" .May be its a Native speaker thing ! can somebody please explain ?
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a majority of the animals is driven to migrate from friendly habitats to hostile environs

isn't the verb referring to the noun a majority of animals and not animals?
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Can someone please explain what is wrong with D.
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D is a comma splice (a run-on). There is no proper conjunction between the two verbs. We must put an 'and' between 'scientists' and occurs.
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Hi daagh ,

I chose C as 'occurs' and 'are' are correct in terms of agreement to the subject, but I was completely thrown off by 'explainable only by a choice few behavioral scientists'. Can you please tell me what this term means?
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Can anyone please explain the differences between options b and c?
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Option C does not change the intended meaning whereas option B distorts by associating “Only” with the phenomenon and not with the scientists

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My understanding:

Subject and Verb: "Phenomenon" is singular, so "occurs" is correct. "Occur" would be used for plural subjects.

Modifiers:

"Explainable" modifies the whole sentence, indicating that only a few scientists can explain the phenomenon.
The "only" in "occurs" limits the reason for the mass suicide, implying it happens only after a majority of the animals migrate.
Correct Verb Agreement: In “after a majority of the animals is driven to migrate,” the subject “a majority” should take the plural verb “are driven” instead of “is.”

Between C and D: The structure in D is "The phenomenon is explainable" suggesting that the phenomenon is always explainable, which might be too strong.
Also, there should be an "and" between "students" and "occurs".

For option E: The phrase "it occurs" is less concise and adds unnecessary complexity. If the structure would have been "can be explained" and "occurs" then the sentence would be more clearer.
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