Which of the Following Statements About Neural and Chemical Influences

Which of the following statements about neural and chemical influences on aggression is true?

A) Stimulation of the amygdala yields aggression in primates regardless of the social circumstances.
B) Too much serotonin tends to foster aggression.
C) Too little testosterone tends to foster aggression.
D) Most of the data cited in the text as evidence for the relationship between neurochemicals and aggressive behavior is correlational data.