Chelsea Is in the Hospital After Injuring Her Knee in a Bike

Chelsea is in the hospital after injuring her knee in a bike accident.During a visit,her sister shows her the newest photos of the family dog,her niece and nephew,her little brother dressed for Halloween,and her parents.While looking at the photos Chelsea hardly notices her postsurgical pain.The reduced pain results from activation of the

A) amygdala.
B) arcuate nucleus.
C) prefrontal cortex.
D) anterior cingulated cortex.