求解释，骨灰级的童鞋们，帮帮忙。。。

汪寒寒 · 发表于 2011-9-15 15:07:11

Surveys show that every year only 10 percent of cigarette smokers switch brands. Yet
the manufacturers have been spending an amount equal to 10 percent of their gross
receipts on cigarette promotion in magazines. It follows from these figures that inducing
cigarette smokers to switch brands did not pay, and that cigarette companies would have
been no worse off economically if they had dropped their advertising.
19. Of the following, the best criticism of the conclusion that inducing cigarette smokers
to switch brands did not pay is that the conclusion is based on
(A) computing advertising costs as a percentage of gross receipts, not of overall costs
(B) past patterns of smoking and may not carryover to the future
(C) the assumption that each smoker is loyal to a single brand of cigarettes at any one
time
(D) the assumption that each manufacturer produces only one brand of cigarettes
(E) figures for the cigarette industry as a whole and may not hold for a particular
company
为什么选E

求解释，骨灰级的童鞋们，帮帮忙。。。

所属分类: GMAT考试

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