Researchers Learned That ___________ by Looking at the Molars and Chewing

Researchers learned that ___________ by looking at the molars and chewing muscles of H.erectus.

A) H.erectus was more dependent on tubers than earlier hominins
B) H.erectus was more dependent on hunting than earlier hominins
C) the chewing apparatus of H.erectus was essentially identical to that of H.habilis
D) the chewing apparatus of H.erectus was different from that of H.habilis
E) H.erectus had not yet begun to hunt.