We Know That the Inhabitants of Klasies River Mouth Were

We know that the inhabitants of Klasies River Mouth were hunters because:

A) about 20% of the animal bones found there show evidence of butchering the best cuts of meat
B) there are lots of knife cut marks but few animal gnaw marks on the bones
C) a stone spear point was found embedded in the vertebra of a giant buffalo
D) all of the above