According to the Study by Lloyd Johnston and His Colleagues

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:

A) declined in the late 1990s.
B) was highest during the early 1990s.
C) has been at the same level since 1990.
D) increased significantly between 2000 and 2005.

Correct Answer:

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