The Biological Perspective on Panic Attacks Has Been Supported by Which

The biological perspective on panic attacks has been supported by which of the following?

A) PET scans reveal that panic-disorder patients show a greatly increased blood flow to parts of the right hemisphere of the limbic system.
B) MRI scans have shown that different electrical activity occurs in the brains of panic-disorder patients.
C) PET scans reveal that panic-disorder patients show a greatly decreased blood flow to the right parietal lobe, associated with the secretion of calming hormones.
D) MRI scans have revealed significant brain size differences between the brains of panic-disorder and phobic patients.