By the Middle of the 20^th Century, the Belief That

By the middle of the 20^th century, the belief that some races were inferior was replaced by the concept of "cultural deficiencies." The concept of cultural deficiency was the idea that people from some cultures had stunted physical and psychological growth because of

A) Cultural deficiencies in environment, linguistics, perception, and interpersonal ability were more to blame for life outcomes.
B) Individual differences in genetics were more salient than racial differences, and each race has equal overall intelligence.
C) Each race had its own strengths and features to allow for equal competition between racial groups.
D) Each racial group created positive cultural behaviors to compensate for their genetic deficiencies, so genetics was a fruitless vein of study.