Which one of the following human ancestors probably lived in East Afr…

The correct answer is Option (3) → Australopithecines

Option (1) Ramapithecus — Incorrect. Ramapithecus lived about 15 million years ago.

Option (2) Dryopithecus — Incorrect. Dryopithecus lived about 15 million years ago and was more ape-like.

Option (3) Australopithecines — Correct. Of the options, only Australopithecines fit two million years ago in East Africa. Ramapithecus and Dryopithecus lived about 15 mya, and the Neanderthals much later.

Option (4) Neanderthal man — Incorrect. Neanderthals lived about 1,00,000–40,000 years ago in east and central Asia.

NCERT Extract:
Origin and Evolution of Man – “… About 15 mya, primates called Dryopithecus and Ramapithecus were existing. They were hairy and walked like gorillas and chimpanzees. Ramapithecus was more man-like while Dryopithecus was more ape-like. Few fossils of man-like bones have been discovered in Ethiopia and Tanzania (Figure 6.11). These revealed hominid features leading to the belief that about 3-4 mya, man-like primates walked in eastern Africa. They were probably not taller than 4 feet but walked up right. Two mya, Australopithecines probably lived in East African grasslands. Evidence shows they hunted with stone weapons but essentially ate fruit.”