What Evidence Suggests That Genetic Differences Between Populations Predispose People

What evidence suggests that genetic differences between populations predispose people for different personality types?

A) There are differences in temperament among newborn babies of different ethnic groups.
B) Other biological features, like birth weight, are correlated with ethnic group.
C) A baby's behavior affects the way its caregivers will interact with it.
D) Mothers of different ethnic groups responded differently to their babies' cries.