Research Using Brain Imaging, Such as PET and FMRI, Has

Research using brain imaging, such as PET and fMRI, has revealed that:

A) the limbic system controls negative emotions only.
B) the limbic system controls positive emotions only.
C) different emotions activate unique areas of the brain, so these scans indicate what emotion the person is experiencing.
D) different emotions activate some of the same areas of the brain, so these scans cannot indicate what emotion the person is experiencing.