In One Study, People with Depression Became More Able to Control

In one study, people with depression became more able to control their negative moods after undergoing cognitive behavior therapy. After this therapy, the images of their brains revealed

A) reduced endorphin levels throughout the brain.
B) increased endorphin levels within the subcortical areas.
C) reduced brain activity in the brain areas related to combativeness.
D) more normal activity in brain areas related to emotional processing.