To decrease the number of crimes in city Y, the city's Police Commissioner proposed taking some police officers from low-crime districts of the city and moving them to high-crime districts of the city. His proposal is based on city Y crime data that show that the number of crimes in any district of the city decreases when additional police officers are moved into that district.
The Police Commissioner's proposal depends on which of the following assumptions?
I would have to go with (E). The goal is to decrease overall crime levels. If low-crime districts will become high-crime districts following the redeployment of cops, then there is no sense moving cops around, because the overall crime level will be unlikely to decrease.
Now a look at the the other answers:
(A) It certainly helps that there is precedence for success in this type of operation, but this particular plan's success does not depend on this assumption. The plan will automatically fall apart if it wasn't successful in city X.
(B) We're talking about the number of crimes, so I don't think severity has much relevance.
(C) Again, using the negation test (or whatever its called), if this wasn't true, the argument doesn't fall apart.
(D) Again, negation test suggests this doesn't necessary make the argument succeed or fail.
(E) is stronger than any other argument available.
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