Correlational Studies Between Mood Disorders and Structural Abnormalities in the Brain

Correlational studies between mood disorders and structural abnormalities in the brain have found that

A) depressed patients generally have enlarged brain ventricles.
B) mood disorders are related to abnormally high levels of neurotransmitters in the brain.
C) the hippocampus tends to be smaller in depressed people than in normal people.
D) the pleasure center of the brain tends to be undeveloped in people with mood disorders.