One of the Major Barriers to the Treatment of the HIV

One of the major barriers to the treatment of the HIV and AIDS epidemic worldwide is:

A) the ineffectiveness and uselessness of treatments and prevention for the disease despite years of research
B) the increasing number of intravenous drug users
C) the increasing percentage of homosexuals who practice unsafe sex
D) the increasing percentage of heterosexuals who practice unsafe sex
E) the discrimination against people living with these infections