Drug abuse is defined as a. the consumption of legal drugs for medical purposes b. the consumption of illegal drugs for medical purposes c. the nonmedical or improper use of a drug, which can interfere with a healthy life d. using drugs on an occasional basis until mood is altered

C. the nonmedical or improper use of a drug, which can interfere with a healthy life.

Explanation:

Drug abuse takes into consideration the amount and frequency of use of a drug, regardless if it is legal or illegal and how it interferes with a healthy life.  Drug abuse can occur with nonmedical or prescribed drug too, what defines drug abuse or misuse is the improper use of it and its consequences, it harms a person, her life and people around her.

the telephone is the answer

answer; the president uses mass media to gain support for policies;