Rodney Has an Unfavourable Attitude Toward His Astronomy Professor

Rodney has an unfavourable attitude toward his astronomy professor. In explaining Rodney's attitude, what would a psychologist who took an operant conditioning perspective consider?

A) how other students in the class feel about this particular professor
B) how Rodney feels about his other professors
C) the astronomy professor's personality and general attitude toward Rodney
D) Rodney's history of reinforcement and punishment in dealing with his astronomy professor