Molars and Premolars of Early Archaic Homo Sapiens Are Reduced

Molars and premolars of early archaic Homo sapiens are reduced in size,while in some populations,front teeth may be increased in size.How do anthropologists explain this observation?

A) Front teeth increased in size because of changes in diet,and this forced back teeth to become smaller.
B) Back teeth became smaller because of increased use of material culture for processing food,while front teeth might have increased in size as an adaptation to using them as tools.
C) Hominins shifted from eating roots,which makes use of the back teeth,to fruit,which makes use of the front teeth.
D) The rise and increased use of language required this reconfiguration of the teeth.