The Functional MRI Is Considered Safer Than PET Because The

The Functional MRI is considered safer than PET because the:

A) PET scan requires the attachment of electrodes,which could cause strangulation with sudden movement.
B) PET scan is known to conduct intermittent electroshocks to portions of the brain.
C) PET can be difficult for people to tolerate due to the pain that it elicits.
D) Functional MRI does not involve exposure to radiation,but PET does.