请教逻辑一题

4gmat

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 wil 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)Consumers' perceptions of the quality of a product are based on the actual quality of the product

新东方答案是e,为什么呢?

tongxun

A：q/p，当P的增加大时，就影响了顾客对这个商品的选择
B：这个结论与题目的前提无关。前提：The value of a product is determined by the ratio of its quality to its price
C：与前提无关或相驳。
D：与前提相驳
E：实际上就是前提的变种