Which of the following viruses was thought to have been transmitted to humans and became the source of the HIV-1 pandemic?

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Chimpanzee SIV is believed to have transmitted to humans and evolved into HIV-1, which spread globally and caused the HIV/AIDS pandemic. Sooty-mangaby SIV (A) and African Green monkey SIV (C) have also been found to infect humans, but they have not caused widespread epidemics. Equine infectious anemia virus (D) and Feline immunodeficiency virus (E) only infect horses and cats, respectively, and do not affect humans.

Which of the Following Viruses Was Thought to Have Been