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】Tobacco advertising cannot be the only factor that affects the prevalence of smoking among teen-agers.