What was the brain capacity of Homo erectus ?

900 cc

The option 3 is correct .The estimated brain capacity of Homo erectus is around 900 cc

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.

Two mya, Australopithecines probably lived in East African grasslands. Evidence shows they hunted with stone weapons but essentially ate fruit. This creature was called the first human-like being the hominid and was called Homo habilis. The brain capacities were between 650-800cc. They probably did not eat meat.

Homo erectus had a large brain around 900cc. Homo erectus probably ate meat.

The Neanderthal man with a brain size of 1400cc lived in near east and central Asia between 1,00,000-40,000 years back.