What was the brain capacity of Homo erectus?

The correct answer is Option (3) → 900 cc

Brain size grew step by step during human evolution. Homo habilis, the first human-like being, had a brain of 650-800cc. The next stage, Homo erectus, found as fossils in Java in 1891 and dated to about 1.5 mya, had a large brain of around 900cc and probably ate meat. The Neanderthal man came later, with a brain size of 1400cc.

NCERT Extract:
Origin and Evolution of Man – “… 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. Fossils discovered in Java in 1891 revealed the next stage, i.e., Homo erectus about 1.5 mya. 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.”