For the Most Part,this Chapter Does Not Discuss the Use

For the most part,this chapter does not discuss the use of substances that are not psychoactive.About what proportion of prescription drugs are psychoactive?

A) zero percent
B) a minority,though a substantial minority-roughly one out of five,or 20 percent
C) roughly half (50%)
D) the substantial majority,though not all-roughly 80 percent
E) 100 percent-all are psychoactive