Which is a generalization that can be made from the 2010 DAWN statistics?

a) Drug-related deaths as a result of multiple-drug use are much more common than those which result from single-drug use
b) Autopsy reports listing marijuana use as a direct cause of death are rapidly increasing.
c) Alcohol is now rarely seen in emergency room cases because of the popularity of club drugs.
d) Cocaine is the most frequently reported drug involved in drug-related deaths.

A