The original sentence wants to reflect that: "large amounts of alcohol decrease neurogenesis, but small amounts of alcohol increase it". For this meaning,
A is not right because the subject in the main clause should be the same implied subject in the Unlike clause. "Small amounts of alcohol" is not the right subject.
B and C are NOT complete sentence. Subject is "small amounts", then where is the verb for this subject.
E is not parallel, neurogenesis is compared with
...
A is not right because the subject in the main clause should be the same implied subject in the Unlike clause. "Small amounts of alcohol" is not the right subject.
B and C are NOT complete sentence. Subject is "small amounts", then where is the verb for this subject.
E is not parallel, neurogenesis is compared with
...
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