Concept:Behaviorism is the school of psychology that focuses only on observable behavior, not internal mental states. It was founded by American psychologist John B. Watson. Explanation:In 1913, Watson published the paper "Psychology as the Behaviorist Views It." This paper formally established behaviorism as a distinct approach. Watson argued that psychology should study only objective, measurable relations between environmental events and behavior. His work made psychology a more scientific discipline by focusing on experiments and observable actions. Later, other psychologists like B.F. Skinner and Thorndike expanded behaviorism, but Watson is the original founder. Answer:B. John B. Watson