The Significance of the Study Conducted by Insel, Scanlan, Champoux

The significance of the study conducted by Insel, Scanlan, Champoux and Soumi (1988) in which rhesus monkeys were raised either with a sense of control or without one and later exposed to an anxiety-inducing drug is that chemicals such as neurotransmitters

A) have very direct effects on behaviour.
B) influence behaviour in different ways depending upon the psychological history of the individual.
C) influence individuals in fairly direct and consistent ways regardless of the psychological history of the individual.
D) have few reliable and consistent effects on observed behaviour.