Research Shows That Some Brain Areas Are Overactive in People

Multiple Choice

Research shows that some brain areas are overactive in people with obsessive-compulsive disorder (OCD) .It is not clear,however,that overactivity in these areas causes OCD because

A) the same areas are more overactive in other anxiety disorders.
B) successful psychotherapy normalizes activity in these areas.
C) medications can reduce the overactivity but do not reduce OCD symptoms.
D) some people with OCD do not show overactivity in these areas.