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Abhishek009
Bunuel
If seriously mentally ill people do not receive medication, they can grow unable to support themselves, become irrational, and perhaps even threatening the safety of themselves or others.


(A) and perhaps even threatening

(B) and may even threaten

(C) and even a possible threat to

(D) as well as possibly threatening

(E) as well as a possible threat to

Must be (B)

If seriously mentally ill people do not receive medication, they can
    grow unable to support themselves,
    become irrational, and
    may even threaten the safety of themselves or others.

Even though I agree B is the correct answer, I think if we take "can" common for parallelism, then can+may does not make sense. So the third part fails to be parallel with "can" common. So "can" cannot be be taken common.
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Bunuel
If seriously mentally ill people do not receive medication, they can grow unable to support themselves, become irrational, and perhaps even threatening the safety of themselves or others.


(A) and perhaps even threatening

(B) and may even threaten

(C) and even a possible threat to

(D) as well as possibly threatening

(E) as well as a possible threat to

MANHATTAN REVIEW OFFICIAL EXPLANATION:



This question has to do with parallel structure. The correct structure is ‘grow’, ‘become’ and ‘threaten’. Only B has this combination.
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