Anthropologists Have Studied Head Shape for Well Over a Century

Multiple Choice

Anthropologists have studied head shape for well over a century.A newly discovered population has extremely elongated heads.This probably means that:

A) the population was isolated genetically and so evolved an unusually head shape
B) the growth pattern of the head was influenced by unusual dietary patterns
C) an unusual mutation occurred in this population for elongated heads
D) elongation of the head may not be the result of any biological factor since some people artificially alter the shape of their heads