The line of apes leading to gibbons diverged from other apes about 15 millions of years ago (MYA), orangutans split off about 10 MYA, and gorillas diverged from the line leading to chimpanzees and humans some 8 MYA. That is why, gorillas are the closer relatives of humans than orangutans
what would be the answer if chimpanzee is not in the option ?
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thanks a lot for the answer