The cultures of two closely located cities have generally been found

The cultures of two closely located cities have generally been found to be identical. When one of such twin cities sees an economic slowdown, the event overlaps with increased crime rate in it as compared to the other city. When the economic health is similar in both cities, the two cities exhibit similar crime rates. Therefore, this finding provides definitive evidence that crime rate is a direct result of slowing economy.

Which one of the following is an assumption required by the argument?

(A) Reliable studies have found that lack of financial well-being increases the likelihood of criminal behavior in individuals.
(B) Increasing crime rate is not a cause of slowing economy.
(C) Economy of a city with twin city is generally no slower than another city with no twin.
(D) In a pair of twin cities both suffering from high crime rate, the economies are equally slow.
(E) Twin cities are no less likely to suffer from high crime rate than other cities with no twin.

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