The emergence of HIV/AIDS disease was most likely a result of:
A) an increase in virulence of an existing human retrovirus.
B) a change in human behavior that allowed the virus to spread.
C) a mutation in an existing retrovirus that allowed for increased spread between humans.
D) a rare zoonotic transfer of a retrovirus strain to humans.
E) an increase in homosexual activity among humans.
Correct Answer:
Verified
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