The value of a product is determined by the ratio of its quality to its price. The higher the value of a product, the better will be its competitive position. Therefore, either increasing the quality or lowering the price of a given product will increase the likelihood that consumer will select that product rather than a competing one.

Which of the following, if true, would most strengthen the conclusion drawn above?

(A) It is possible to increase both the quality and the price of a product without changing its competitive position.

(B) For certain segments of the population of consumers, higher-priced brands of some product lines are preferred to the lower-priced brands.

(C) Competing products often try to appeal to different segments of the population of consumers.

(D) The competitive position of a product can be affected by such factors as advertising and brand loyalty.（E）

(E) Consumers’ perceptions of the quality of a product are based on the actual quality of the product.

I chose A. Can someone explain why A is not correct? Thanks

A 说 ：  有可能同时提高产品质量和价格 ， 不失其竞争优势；  题目说的是要么降价，要么提质； 而不是说同时提价提质； GMAT出题那帮人最喜欢玩这些伎俩，唬你入套；

在深圳烤鸡

A不对是因为如果价格升了，质量升了，但是比例没升，甚至比例下将，而仍然保证了产品竞争地位，就相反削弱了结论。

选E，如果取反，人们不是按照实际质量，而是按照价格来判断一个商品，则可能因为价格减低而不买产品，结论不成立了。