Extensive research has shown that the effects of short-term price promotions on sales are themselves short-term. Companies\' hopes that promotions might have a positive aftereffect have not been borne out for reasons that researchers have been able to identify. A price promotion entices only a brand\'s long-term or "loyal" customers; people seldom buy an unfamiliar brand merely because the price is reduced. They simply avoid paying more than they have to when one of their customary brands is temporarily available at a reduced price. A price promotion does not increase the number of long-term customers of a brand, as it attracts virtually no new customers in the first place. Nor do price promotions have lingering aftereffects for a brand, even negative ones such as damage to a brand\'s reputation or erosion of customer loyalty, as is often feared.

    So why do companies spend so much on price promotions? Clearly price promotions are generally run at a loss, otherwise there would be more of them. And the bigger the increase in sales at promotion prices, the bigger the loss. While short-term price promotions can have legitimate uses, such as reducing excess inventory, it is the recognizable increase in sales that is their main attraction to management, which is therefore reluctant to abandon this strategy despite its effect on the bottom line.

6.It can be inferred from the passage that if a company ceased to run short-term price promotions for a particular product, an effect of this change would be to
A. reduce excess inventory of the product
B.lose some of the product's long-term customers
C.reduce the product's overall sales
D.inhibit growth in the number of the product's customers
E.threaten the product's profitability

我选的是B，因为根据红体字说的价格促销的后果会damage customer loyalty,因此B答案减少顾客应该是对的。可为什么答案选的是C呢？请大家指点

damage to a brand\'s reputation or erosion of customer loyalty 是补充说明什麽负面效果。换句话说：不会有品牌名誉受损或是顾客忠程度流失的负面效果。

为什么A不对呢？

While short-term price promotions can have legitimate uses, such as reducing excess inventory

可以直接从原文找到，而且C的话 sale = single price X numbers saled 减少单体的价格来促进number的增加并不能推出sales会减少啊？

还有E，可以从下面一句话推出啊。

Clearly price promotions are generally run at a loss, otherwise there would be more of them.