Who is most closely associated with operant conditioning

A)  B. F. Skinner
B)  Albert Bandura 
C)  Shepard Siegel
D)  Ivan Pavlov

B. F. Skinner is most closely associated with operant conditioning. He developed the theory of operant conditioning which emphasizes the role of consequences in learning behavior. Skinner believed that behaviors that are reinforced (rewarded) are more likely to be repeated, while behaviors that are punished are less likely to be repeated.