单项选择题

What does "the problem" in the first line refer to

A.The fact that government drug abuse organizations are reluctant to inform the public of the drug taking phenomenon among teenagers.
B.The fact that many doctors are ignorant of the drug taking phenomenon among teenagers.
C.The fact that many parents are ignorant of the drug taking phenomenon among their children.
D.The fact that many young people have yielded to the wide use of drugs.