In Atapeura 5,what Does the Heavy Wear on the Incisors

In Atapeura 5,what does the heavy wear on the incisors and canines of early archaic Homo sapiens and Neandertal specimens indicate?

A) the use of the front teeth for gripping materials
B) the purposeful modification of teeth to demonstrate social rank,as with the Aztecs
C) their use for shaping the cutting edges of stone blades
D) the chewing of massive amounts of fibrous materials