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Bunuel
There has been a drastic decrease in crime caused by increasing the surveillance by undercover detectives against drug dealers.


(A) decrease in crime caused by increasing the surveillance by undercover detectives against

(B) decrease in crime because of increased surveillance by undercover detectives of

(C) decreasing in crime because of increasing surveillance by undercover detectives to

(D) crime decrease caused by increasing surveillance by undercover detectives against

(E) crime decrease because of increased surveillance by undercover detectives to

MANHATTAN REVIEW OFFICIAL EXPLANATION:



The key to answering this question is determining what preposition to use at the end. Is it surveillance by someone against/to/of something? All the choices here are passive, so you cannot rewrite this sentence using the active voice. The correct expression is ‘surveillance of’. Only choice B is correct.
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I'd like some feedback on my line of reasoning:

A) is wrong because the word: increasing is a progressive tense: which would have to imply that the surveillance is still being increased. We can't discern that from the sentence.
B) the tense structure seems correct
C) both progressive - would imply that its still ongoing - same logic for a. so C is also wrong.
D) increasing implies progressive - the nature isn't ongoing.
E) I played this by ear - a drastic crime decrease just sounds awkward.

I got the correct answer, but I'm afraid my line of reasoning is a little off. Would like to learn to stop getting these answers correct by just playing by ear.

Anybody willing to help?
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