The answer is; C
A PET scan is a positron emission tomography used to image the inside of the body. It involves the ingestion of a radioactive element. The element is actively absorbed by the tissue with active cellular activity hence these areas will show as bright spots when the body (this case the brain) is scanned.
The movement of air in the atmosphere. For example HOT air collides with COOL to get high winds and storms
PNS controls this response
The portion of the system that's outside the brain and medulla spinals. Abbreviated PNS. The nerves within the PNS connect the central system (CNS) to sensory organs, like the attention and ear, and to alternative organs of the body, muscles, blood vessels, and glands.
Papillary response could be a physiological response that varies the scale of the pupil, via the optic and cranial nerve.