What Makes the Hominin Remains from Gran Dolina Cave,Atapuerca,of Special

What makes the hominin remains from Gran Dolina Cave,Atapuerca,of special interest to anthropologists?

A) The small size of the new species of Homo erectus found here demonstrates the effects of evolving on an isolated island.
B) Several of the bones have cutmarks,which most likely represents some sort of ritual or ceremonial treatment of the dead.
C) Some of the bones have many cutmarks,indicating butchering and suggesting the earliest evidence of cannibalism in human evolution.
D) Some of the bones show impact marks,suggesting that they were broken open for marrow by large carnivores that also lived in these caves.