The percentage of the illicit drug use declined in the late 1990s
Answer: Option A
Explanation:
According to a study that was made by Lloyd Johnston about the use of drugs, alcohol by the students of different agrees including young adults, the college students and also a difference in the consumption of drugs by the boys and the girls was shown in the study.
The trends of the study show that there had been a decline in the consumption of drugs or that of alcohol in the time period of 1990s which was at a very high rate in the 1980s.