Concept:Behaviorism is a theory that focuses only on observable behavior and rejects internal mental states. John B. Watson is recognized as the founder of this school of psychology.Explanation:In 1913, John B. Watson published a paper titled "Psychology as the Behaviorist Views It". He argued that psychology should study only what can be seen and measured — actions and responses to the environment. Watson believed that all behavior is learned through interaction with the environment. This was a major shift from earlier psychology, which focused on introspection. While other psychologists like B.F. Skinner and Edward Tolman made important contributions later, they built on Watson’s ideas. Edward Thorndike had earlier work on learning, but he did not formally establish behaviorism. Therefore, the credit for founding behaviorism goes to John B. Watson. His work helped make psychology a more scientific field by using objective methods and experiments.Answer:John B. Watson (Option B)