Question from Next Step 2000Q workbook

So there's a psy problem in the workbook, it goes like this:

As a class of psychoactive drug, stimulants:
I. can promote the release of neurotransmitters
II. can reduce the release pf neurotransmitters
III. can inhibit the absorption of neurotransmitters
IV. cause suppression of cerebellar activity

a. I, III
b. II, III
c. I, II, III
d. I, II , III, IV

So, normally, I picked A. But the explanation says that " stimulants possess multiple mechanisms of action, including both the...

Question from Next Step 2000Q workbook