Taphonomic Research at the Hudson-Meng Bison Bonebed in Northwest Nebraska

Taphonomic research at the Hudson-Meng bison bonebed in northwest Nebraska showed that:

A) the ancestors of modern Plains Indians purposely broke open bison skulls to remove the brains for use in tanning hides.
B) natural processes such as incomplete burial and subsequent exposure to sunlight could have caused the tops of the bison skulls to decompose.
C) the bonebed was a result of the ancestors of modern Plains Indians running a herd of 500 bison off of a low cliff and subsequently dragging them to a processing area.
D) the bonebed was a result of both natural bone accumulation and human hunting practices.