A、Because it involves a very high percentage of high school students. B、Because it is usually connected with drunk drinking. C、B

Today American parents are finding themselves in a dilemma about how to deal with teenage drinking, a serious social problem.
    A recent survey has revealed that 92% of high school seniors have tried alcohol at least once and two-thirds take a drink once a month. Alcohol has resulted in a lot of teenage car crashes, as well as suicides and murders. Parents are wondering why they can’t keep their children from drinking. Now many are beginning to conclude that it is not the kids but the parents who should be held responsible for their permissive attitudes. Some parents find that stern attitudes and methods are impractical and ineffective. They try to teach their children to drink responsibly. Many parents believe that supervised drinking is a safe solution.
    However, an increasing number of parents fear that this will endanger their children’s safety. Therefore, hardliners are striving to form a united front to lay down common rules to be strictly enforced. And the most popular method in some communities is what they call "safe homes", where unsupervised parties with alcohol are forbidden. The hardliners think that in this way their children will learn self-control.
    But experts and educators fear that such attitudes might invite outright rebellion from the children. Both sides agree that teenage drinking can be dealt with if no excessive drinking attitudes are established early and supported by school authorities.
Q. 15. Why is teenage drinking said to be a serious problem according to the passage?
Q. 16.Who should be held responsible for teenage drinking?
Q. 17.Which of the following measures by parents is not mentioned?
Q. 18.How can teenage drinking be fundamentally solved, according to experts and educators?