Among Gay Men There Was a Sharp Decrease in Risky

Among gay men there was a sharp decrease in risky sex and an increase in monogamous relationships.Unfortunately, this trend has recently reversed because

A) intravenous drug use among homosexuals has dramatically increased.
B) new medical treatments have helped HIV/AIDS victims to live longer and not look sick, thus, giving a false impression and encouraging foolish risk taking.
C) both male and female homosexuals are more likely than heterosexuals to have multiple sex partners and engage in casual sex.
D) the incubation period for HIV to develop into AIDS is longer for homosexuals than it is for heterosexuals.