Critical Reasoning

Editorial: In order to preserve the health of its local economy, Metropolis should
not permit a Costmart warehouse department store to open wimincity limits. It has
been demonstrated that when Costmart opens a warehouse department store within
a city, the bankruptcy rate of local retailers increases in that city by twenty percent
over the next several years.

Which of the following questions would be most useful for evaluating the conclusion
of the editorial?

(A) Does the bankruptcy rate of local retailers in a city generally stabilize several
years after a Costmart warehouse department store opens?
(B) Do most residents of Metropolis currently do almost all of their shopping at
stores within the city limits of Metropolis?
(C) Have other cities that have permitted Costmart warehouse department stores
within city limits experienced any economic benefits as a result?
(D) Is the bankruptcy rate for local retailers in Metropolis higherthan in the average
city that has permitted a Costmart warehouse department store within city
limits?
(E) Does Costmart plan to hire employees exclusively from within Metropolis for
the proposed warehouse department store?


I chose the answer as B becuase [spoiler] if the locals are shopping at the local markets and shift to the Costmart warehouse, the bankruptcy rate will increase.If not then it won't affect. [/spoiler].
Also can you please give an idea of how to tackle this evaluate kind if questions?