The Historical Progress of the HIV Infection Began to Be

The historical progress of the HIV infection began to be tracked in 1979.Which is the first historical event in sequence of its discovery?)

A) Infection in heterosexual men and women
B) Infection in hemophiliacs
C) Infection in injection drug users
D) Increased incidence of Kaposi carcinoma in young homosexual men
E) Increased incidence of P.jiroveci (previously PCP)