The hormone that is typically implicated in aggressive behavior is

A) estrogen.
B) testosterone.
C) epinephrine.
D) norepinephrine.

Testosterone is the hormone primarily associated with aggressive behavior, as it is related to the development of secondary sex characteristics, including increased muscle mass and bone density, and higher levels of aggression in some individuals. Estrogen is more closely associated with reproductive functions and other physiological processes. Epinephrine and norepinephrine are stress hormones and are typically involved in the "fight or flight" response to perceived threats, but they are not as closely linked to aggressive behavior as testosterone.