单项选择题

Is American losing the battle against teen drug abuse Despite years of antidrug campaigns, drug use among American teens is increasing dramatically. Consider the statistics. The PRIDE (Parents’ Resource for Drag Education)survey of more than 140,000 Students shows that drug use among 11-to 14-year olds is on the rise, with 11.4 percent of junior-high students reporting monthly use of marijuana(大麻)， cocaine, or other illicit drugs. In a study issued last year by the National Center on Addiction and Substance Abuse (CASA) at Columbia University, researches found that drugs are more readily available and used by youth at a younger age than ever before.
The findings have sounded a national alarm and ongoing debate about how to counter the disturbing trend. Last year, President Clinton called the dramatic increase in drug use among America’s youth "the ultimate threat to the future of our country."
Ironically, today’s teenagers are exposed to more drug education than any previous generation -- the federal government has required public schools to teach drug prevention since 1987. The fact that drug use is still on the rise has caused policymakers, school officials, and parents to examine current drug prevention efforts.
While many parents call for more governmental and school intervention to tackle the drug problem, the PRIDE survey revealed that parental involvement plays a key role in teenage use. According to the survey, only 31 percent of parents are warning their children often about the dangers of drugs, but that these parental warnings can have a dramatic effect. Students who are given a clear set of rules reported 57 percent less drug use.

What is the meaning of "tackle" in the Paragraph 4（）

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