The Focus on Neuroscience Box "Comparing Psychotherapy and Antidepressant Medication

The Focus on Neuroscience box "Comparing Psychotherapy and Antidepressant Medication" features a research study involving PET scans of people with major depressive disorder before they received treatment. As compared to the control participants, who did not have depressive symptoms, the individuals with major depressive disorder had:

A) lower levels of brain activity in the prefrontal cortex, the caudate nucleus, and the thalamus.
B) higher levels of brain activity in the prefrontal cortex, the caudate nucleus, and the thalamus.
C) lower levels of brain activity throughout the brain.
D) lower levels of activity in limbic system regions but not in other areas of the brain.