One question of GMAT

The recent upheaval in the office-equipment retail business , in which many small firms have gone out of business, has been attributed to the advent of office equipment "superstores" whose high sales volume keeps their prices low.
This analysis is flawed, however, since even today the supermstores control a very small share of the retail market.
which of the following, if true, would most weaken the argument that the analysis is flawed?

A. Most of the larger customers for office equipment purchase under contract directly from manufacturers and thus do not participate in the retail market

B The superstores' heavy advertising of their low prices has forced prices down throughout the retail market for office supplies

which would you choose?why?

Thax.

选B

A。大宗客户没进入零售市场，在零售市场外，与零售市场无关，是OUT OF SCOPE

B。SUPERSTORE的大作广告，宣传低价格，使零售市场该商品价格下降（所以虽占的市场额度小，同样影响价格，是很多小公司推出市场，造成UPHEAVAL）weaken不是superstore造成动荡的结论

DONOT DREAM US。IT IS NOT HEAVEN，BUT HELL