The most recent research evidence suggests that the relationship between the brain (structure, function, neurotransmitters) and psychosocial factors (socialization, rearing, life events) is best described as

A. far too complex to ever understand how one system influences the other.
B. an interaction where the brain affects psychosocial factors and vice versa.
C. a system where behavior and psychosocial factors impact the brain but not the other way around.
D. a system where the brain directly influences behavior and psychosocial factors but not the other way around.