Margaret Mead,in Her Research in Samoa

Margaret Mead,in her research in Samoa:

A) concluded that the emotional turbulence of adolescents in the United States is culturally rather than biologically based.
B) concluded that there are fixed gender roles regardless of the culture of origin.
C) discovered that adolescence was universally difficult for both children and parents and required intervention from other members of society.
D) demonstrated the importance of genes rather than cultural conditioning.
E) discovered the participant observation fieldwork method that would be used by all anthropologists afterwards.