Read the following four (A-D) statements:
(a) The cranial capacity of Homo habilis was 650-800 c.c
(b) The cranial capacity of Homo erectus was about 900 c.c
(c) Around two mya Australopithecus probably lived in east african grasslands.
(d) During the ice age, Homo sapiens arose.
How many of the above statements are not incorrect: