Taphonomists Believe That the Olduvai Bone and Stone-Tool Sites Were

Taphonomists believe that the Olduvai bone and stone-tool sites were not the result of the death of a large number of animals because

A) mass deaths usually involve members of a single species, but the Olduvai sites contain members of different species.
B) there is usually evidence of dehydration when mass deaths occur, but there is no such evidence at Olduvai sites.
C) mass deaths are very rare among modern animals on the savanna.
D) there is little mixing of bones of different species.