Which of the Following Best Explains How Drug Use Spreads

Which of the following best explains how drug use spreads?

A) Drug use is learned through influences coming from one's peers.
B) Drug use is spread through the use of contaminated drug paraphernalia.
C) Drug use is linked to genetic predisposition.
D) Drug use involves a sequence that starts with alcohol use,spreads through marijuana use,and inevitably ends with addiction to the "hard" drugs.
E) Those addicted recruit newcomers in order to sell them "hard" drugs.