In the given options, Ramapithecus is the most primitive ancestor of man Edward Lewis $(1932)$ obtained fossil of Ramapithecus from Pliocene rocks of Shivalik hills of India.

Ramapithecus survived about $14-\,i 15$ million years ago during late Miocene to Pliocene. Ramapithecus became extinct about $7-\,i 8$ million years back.