How Did Margaret Mead's Work Contribute to a Greater Understanding

How did Margaret Mead's work contribute to a greater understanding of human sexuality?

A) Her work provided evidence that men and women are naturally sexually promiscuous.
B) Her work challenged the assumption that sexual practices should be private rather than public.
C) Her work challenged the assumption that U.S. attitudes toward sexuality were universal traits fixed in human nature.
D) Her work explored the commonalities between human sexual practices and the sexual practices of other primates.