题目选项分析

Many people argue that tobacco advertising plays a crucial role in causing teen-agers to start or continuesmoking. In Norway, however, where there has been a ban on tobacco advertising since 1975, smoking is atleast 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?

【选项】More teen-agers smoke if they are not exposed to tobacco advertising than if they are.