Concept:Operant conditioning is a learning theory where behaviour is shaped by rewards and punishments.Explanation:B.F. Skinner proposed operant conditioning based on his experiments with animals. The theory states that learning occurs when a learner emits a desired response, which is then strengthened by reinforcement. Other theorists like Thorndike (stimulus-response) and Hull (drive reduction) propounded different theories. Therefore, operant conditioning is specifically linked to Skinner.Answer:D. Skinner