Which of the Statements About the Emergence of HIV/AIDS Is

Which of the statements about the emergence of HIV/AIDS is incorrect?

A) It is likely that HIV/AIDS began as a zoonotic disease,evolving from SIV,the simian immunodeficiency virus.
B) HIV spread throughout sub-Saharan Africa via colonization and urbanization.
C) It is believed that HIV was spread to the United States from Southeast Asia during the Vietnam War.
D) The first cases of AIDS in the United States were seen in 1980.