Research on the biology of aggression has clearly demonstrated that

A) human aggression is an unlearned instinct.
B) there is no physiological basis for aggression in humans.
C) animals can be bred for aggressiveness.
D) neural influences contribute to aggressive behavior by men but not by women.

Neural Influences

The impacts of the nervous system's structure and function on behavior, emotions, and cognitive processes.

Aggression

A variety of actions that may cause physical or mental damage to the individual, others, or items surrounding them.

Physiological Basis

The underlying physical and biological mechanisms that contribute to a particular behavior, function, or process in living organisms.