In an FMRI Study of the Prisoner's Dilemma, Rilling Et

In an fMRI study of the Prisoner's Dilemma, Rilling et al. (2002) compared playing a human opponent versus computer opponent. What did they find?

A) Activity in the striatum is more dependent on the opponent than the monetary reward.
B) Activity in the striatum reflects monetary reward irrespective of the opponent.
C) Activity in the amygdala is more dependent on the opponent than the monetary reward.
D) Activity in the amygdala reflects monetary reward irrespective of the opponent.