After Buying an Electric Grass Trimmer, Richard Changed into His

Multiple Choice

After buying an electric grass trimmer, Richard changed into his shorts and went out in his bare feet to trim the grass. When he moved the trimmer too close to his leg, the rotating line cut a gash in his ankle. Richard no longer wears shorts or goes barefoot when he uses the grass trimmer. Richard's behavior of dressing inappropriately for gardening has been changed as a result of:

A) punishment by application.
B) punishment by removal.
C) negative reinforcement.
D) learned helplessness.