Which One of the Following Statements About the Evolution of HIV

Which one of the following statements about the evolution of HIV is false?

A) All strains of HIV are included within clades of SIV strains.
B) Each strain of HIV is more closely related to a strain of SIV than to other HIV strains.
C) Humans acquired different subtypes of HIV from different primate hosts.
D) AIDS appeared first in Africa,probably prior to 1940.
E) Because of the low mutation rate of the HIV virus,it is possible to use phylogenetics to determine the source of infection for specific individuals.