1 group SIV- chimpanzee V- 1 SIV. chimpanzee SIV- chimpanzee L SIV- chimpanzee SIV chimpanzee HIV. 1 group O HIV- group P SIV. gorilla SIV- chimpanzee SIV-red-capped manga SIV- drill SIV. vervet monkey SIV- tantalus SIV. sooty mangabey HIV- 2 group A HIV-2 group B SIV. sooty mangabey SIV. syke\'s monkey SIV- greater spot-nasal monkey SIV. De Brazzas monkey Solution Choice 4 is correct. Reason: It can be seen from the image that both SIV and HIV emerged at a similar rate and pace in ancient times and their local distribution shares similar levels of complexities. It can also be noted that N type HIV1 is not closely related to O type HIV but represent a divisional subtype of the main HIV-1 type. Also, it can be carefully noted in the initial part of the image that SIV had already emerged in chimpanzees much before evolution of HIV types. However, futher evolution of HIV from SIV can be easily traced back from chimpanzees to humans. Further, evolutionay timelines and the image shows that HIV-1 group O and P are closely related and group A and B of HIV-2 were transmitted to humans. Thus, the information states that choice 4 is most correct..