115. Many people argue that tobacco advertising plays a crucial role in causing teen-agers to start or continue smoking. In Norway, however, where there has been a ban on tobacco advertising since 1975, smoking is at least as prevalent among teen-agers as it is in countries that do not ban such advertising.
Which of the following statements draws the most reliable conclusion from the information above?
(A) Tobacco advertising cannot be the only factor that affects the prevalence of smoking among teen-agers.
(B) Advertising does not play a role in causing teen-agers to start or continue smoking.
(C) Banning tobacco advertising does not reduce the consumption of tobacco.
(D) More teen-agers smoke if they are not exposed to tobacco advertising than if they are.
(E) Most teen-agers who smoked in 1975 did not stop when the ban on tobacco advertising was implemented.
If tobacco advertising were the only factor that affected teenage smoking, there would be a difference in the
prevalence of smoking between countries that ban such advertising and those that do not. According to the
passage, there is no difference, so tobacco advertising cannot be the only factor. Therefore, choice A is the best
answer.Since no information is given about what effect, if any, the Norwegian ban on tobacco advertising had on
teenage smoking in Norway, none of choices B through E can be concluded, since each makes some claim
about the effects of tobacco advertising, or of banning such advertising, on teenage smoking or on tobacco consumption.
怎么理解b的解释啊?谢谢。
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