One New Theory Concerned with Dopamine Levels in the Brain

One new theory concerned with dopamine levels in the brain and schizophrenia suggests that:

A) the limbic system may have too much dopamine and the cortex may have too little dopamine.
B) hallucinations and other positive symptoms of schizophrenia are the result of decreased levels of dopamine levels throughout the whole brain.
C) the limbic system may have too little dopamine and the cortex may have too much dopamine.
D) hallucinations and other positive symptoms of schizophrenia are the result of decreased levels of dopamine in the fluid-filled cavities called ventricles.