According to the study by Lloyd Johnston and his colleagues at the Institute of Social Research at the University of Michigan monitoring the drug use of America's high school seniors in a wide range of public and private high schools,the percentage of illicit drug use:

Question

Quizplus · Accepted Answer

The study by Lloyd Johnston and his colleagues at the Institute of Social Research at the University of Michigan monitoring the drug use of America's high school seniors in a wide range of public and private high schools found that the percentage of illicit drug use declined in the late 1990s. Therefore, option A is the correct choice.

According to the Study by Lloyd Johnston and His Colleagues