Why Is It Important to Understand That Human Racial Categories

Why is it important to understand that human racial categories are based upon perceptions of phenotypic features and not on genotypes?

A) Because racial categories are internationally standardized
B) Because race is socially constructed, not biologically determined
C) Because race should be determined by skeletal measurements, especially cranial capacity
D) Because genealogies cannot be used in the study of human kinship
E) Because racial genotypes are more accurate