Biological Research Concerning the Development of Mood Disorders Suggests That

Biological research concerning the development of mood disorders suggests that:

A) acetylcholine and dopamine may be key neurotransmitters in depression.
B) part of the problem of depression is the underproduction of cortisol.
C) a long form of the gene 5-HTT may predispose a person to depression.
D) many chronically depressed people have shrinkage of the hippocampus and amygdala.