求教GWD TTGWD4-Q7!! 每次都不明白，也记不住正确答案，很苦恼！！

silviahelena

Although the discount stores in Goreville’s central shopping district are expected to close within five years as a result of competition from a SpendLess discount department store that just opened, those locations will not stay vacant for long.  In the five years since the opening of Colson’s, a nondiscount department store, a new store has opened at the location of every store in the shopping district that closed because it could not compete with Colson’s.
Which of the following, if true, most seriously weakens the argument?
A.    Many customers of Colson’s are expected to do less shopping there than they did before the SpendLess store opened.
B.    Increasingly, the stores that have opened in the central shopping district since Colson’s opened have been discount stores.
C.    At present, the central shopping district has as many stores operating in it as it ever had.
D.    Over the course of the next five years, it is expected that Goreville’s population will grow at a faster rate than it has for the past several decades.
E.    Many stores in the central shopping district sell types of merchandise that are not available at either SpendLess or Colson’s.
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silviahelena

呃，恳请大牛帮忙，自己顶一下...

destiny流年

我也是啊...同问...

destiny流年

http://forum.chasedream.com/GMAT_CR/thread-179545-1-1.html
可以看看讨论帖~

hartmann

This is an analogical reasoning.

Central discount stores will close due to competition from S store, but vacant places will be filled with new non-discount stores. This is so because of an analogy: Central stores have been closing due to competition from C store (whether is a discount or non-discount is irrelevant), and vacant places have been filled with new stores. Assumption: these stores should be non-discount stores.

B attacks the assumption: new stores that filled the vacant places were, in effect, discount stores.

So, discount stores were simply replacing discount stores. Thus, they didn't suffer from competition with C store.