Which of the following researchers thought that reinforcement was the central factor involved in behavioural change?

The researcher who believed that reinforcement was the central factor involved in behavioral change is B.F. Skinner. He was a prominent figure in the field of behaviorism and is best known for his work on operant conditioning. Skinner argued that behaviors can be shaped and modified through reinforcement and punishment. Reinforcement, which can be positive (adding a pleasant stimulus) or negative (removing an unpleasant stimulus), increases the likelihood that a behavior will occur again in the future. Skinner's experiments with rats and pigeons demonstrated how behavior could be influenced by the consequences that followed it, thus establishing a foundational understanding of behavioral change through reinforcement.