Using Positron Emission Tomography, Researchers Have Compared the Activity Levels

Using positron emission tomography, researchers have compared the activity levels in the left and right hemispheres of bipolar (manic-depressive) brains and schizophrenic brains and found that activity is

A) low in the left hemisphere for both bipolar and schizophrenic brains.
B) low in the right hemisphere for both bipolar and schizophrenic brains.
C) low in the left hemisphere in the bipolar brain and low in the right hemisphere for the schizophrenic brain.
D) low in the right hemisphere in the bipolar brain and low in the left hemisphere for the schizophrenic brain.