What Did Hill Suggest Accounted for the Comparative Abundance of Bison

What did Hill suggest accounted for the comparative abundance of bison limb bones relative to other bison bones at the Agate Basin site?

A) Bison long bones contain little in the way of meat and marrow, making them undesirable for transport back to camp.
B) Bison are large animals that would be extremely difficult to carry whole; long bones would be preferentially transported because of their high-utility (meat and marrow) .
C) Carnivore activity resulted in the natural accumulation of limb bones at the site; limbs are the easiest part of the skeleton for carnivores to remove.
D) The limb bones were the only bones to remain after carnivores scavenged the rest of the axial and appendicular skeletons.