Roger Has Been Convicted of Sexually Assaulting Several Young Children

Roger has been convicted of sexually assaulting several young children. In prison he undergoes aversion therapy. He is presented with pictures of young children while receiving unpleasant electric shocks. Eventually, pictures of young children become aversive stimuli. In this procedure, the electric shocks are described as

A) unconditioned stimulus.
B) conditioned stimulus.
C) conditioned response.
D) unconditioned response.
E) neutral stimulus.