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Option A only tells us the reason for which the number of police has been reduced
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This is not a good question. Is it really from Princeton Review? B is the only weakener, as it attacks the author's underlying assumption--that the reduction in the police force actually caused the decline in revenue. If someone rewrote this as a non-EXCEPT q with B as the answer, I guess it would be okay.

A is irrelevant. We don't care why the number of officers declined. We care why sales declined. Besides, this change happened after the reduction in the police force.
C strengthens the argument by ruling out a potential alternative cause.
D doesn't help us to assess whether the reduction in the police force caused the decline. Since the reduction in police was city-wide, it could have been the cause of retail declines throughout the city. If anything, this could be seen as a strengthener.
E is irrelevant. We don't need to know what the officers do all week long. We just need to know whether the reduction affected the decline, and this doesn't do anything to suggest that it didn't.
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Official Explanation

In all likelihood, the district’s residents contribute to the revenues of businesses there by purchasing goods and services from them. A net loss in the number of district residents would provide an alternative explanation for the loss of revenue.

Choice (C) rules out this possibility, thereby strengthening the claim that the loss in revenue was due to the city’s reduction in its police force and, accordingly, that increasing the size of the force will reverse the decline in revenues.

The correct answer is (C).
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