Manufacturers sometimes discount the price of a product to retailers for a promotion period when the product is advertised to consumers.  Such promotions often result in a dramatic increase in amount of product sold by the manufacturers to retailers.  Nevertheless, the manufacturers could often make more profit by not holding the promotions.

Which of the following, if true, most strongly supports the claim above about the manufacturers' profit?

(A) The amount of discount generally offered by manufacturers to retailers is carefully calculated to represent the minimum needed to draw consumers' attention to the product.

(B) For many consumer products the period of advertising discounted prices to consumers is about a week, not sufficiently long for consumers to become used to the sale price.

(C) For products that are not newly introduced, the purpose of such promotions is to keep the products in the minds of consumers and to attract consumers who are currently using competing products.

(D) During such a promotion retailers tend to accumulate in their warehouses inventory bought at discount; they then sell much of it later at their regular price.

(E) If a manufacturer fails to offer such promotions but its competitor offers them, that competitor will tend to attract consumers away from the manufacturer's product.

不明白为什么选D

Manufacturers 期望的是通过降价增加销量，来谋取利润。

但是D中，如果零售商在Manufacturers 降价的时候囤货然后在恢复原价以后买出，等于受益的不是Manufacturers 而是零售商。

但是不管怎么样，manufactures还是把大量的货给卖出去了，零售商怎

么处理与manufactures无关了啊？

Manufacturers 期望的是for a promotion period when the product

is advertised to consumers？

零售商在产品低价时期大量从生产商处买进货物，从而在价格升高之时就可以不再买进或者少买，

这样一来，生产商就亏了，虽然在低价时期全部卖了，但他本可以在价格升高之时再卖赚得更多的。