Typically, a heroin abuser may inject up to ________ a day.

A. 10 times
B. 7 times
C. 2 times
D. 4 times

I think D?

What does your text say?

@Reed I couldn't find anything about this question in my text :/

In this study, heroin use was one to two times a day. This is only one study, however, so may not be generalized. It was the best I could find quickly:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC305269/

There must be something in your class notes or text materials about this, otherwise you would not be asked the question.

It is D according to facts on Heroin Abusers.

Typically, heroin abusers inject up to 4 TIMES a day.

The answer is D- 4 times a day.

I think is D