答案B不行吗？这里的stores不是指shopping central districts的store吗

bernadotte

Community activist:  If Morganville wants to keep its central shopping district healthy, it should prevent the opening of a huge SaveAll discount department store on the outskirts of Morganville.  Records from other small towns show that whenever SaveAll has opened a store outside the central shopping district of a small town, within five years the town has experienced the bankruptcies of more than a quarter of the stores in the shopping district.



The answer to which of the following would be most useful for evaluating the community activist’s reasoning?



A.   Have community activists in other towns successfully campaigned against the opening of a SaveAll store on the outskirts of their towns?

B.   Do a large percentage of the residents of Morganville currently do almost all of their shopping at stores in Morganville?

C.   In towns with healthy central shopping districts, what proportion of the stores in those districts suffer bankruptcy during a typical five-year period?

D.   What proportion of the employees at the SaveAll store on the outskirts of Morganville will be drawn form Morganville?

prayer

答案是C么？题目中说healthy的district。其他地方出现破产，但是没提到healthy，体现了这个地方和其他地方的不同之处。所以应该找具有一样特点的地方来比较。
B，residents，文章中没提到，属于无关因素

铁甲

c，a quarter的破产率是大还是正常？这个问题很关键。假如正常情况下5年中也会有1/4破产，那就不能证明新店对老店产生了冲击。
b，居民有很大一部分在本镇购物嘛？这个无关，无论比例多少，只要开新店总会对老店产生冲击的。