Why Are Cross-Cultural Studies Important for Our Understanding of Sex

Why are cross-cultural studies important for our understanding of sex and gender?

A) They allow us insight into an individual's chromosomal makeup.
B) They reinforce the idea that biology alone cannot predict the roles men and women play in a given culture.
C) We can then predict an individual's behavior, strength, and intelligence, as well as the roles of men and women in a given culture.
D) They help reinforce the idea that gender and sex are the same in all cultures.