Answer:
A.Faces of attractive people looking directly at the viewer decreased activity in the ventral striatum, a brain area associated with the expectation of rewards.
Explanation:
An fMRI study of participants scanned while looking at color photos of 40 different faces (some looking at the viewer and some looking away). When we make eye contact with a physically attractive person the ventral striatum of our brains is activated which is an area of the brain that predicts reward.