Skulls of (1) modern gorilla, (2) australopithecus afarensis, (3) homo erectus, (4) homo neanderthalensis, (5) modern human which of the following can be inferred from the differences between the skulls of australopithecus afarensis and homo neaderthalensis?

It seems that you have missed the necessary options for us to answer this question so I had to look for it. Anyway, here is the answer. Based on the given skulls above, the one that can be inferred from the differences between the skulls of Australopithecus afarensis and Homo neaderthalensis is this:  Homo neaderthalensis had a larger cranial capacity than Australopithecus afarensis and had a larger brain.