Which of the following best identifies the behaviorists primary emphasis for the study of psychology?

A) Cognitive processes
B) Observable behavior
C) Conditioned stimuli
D) Introspection

Behaviorists primarily focus on observable behavior rather than internal mental processes. They believe that behavior can be modified through conditioning and reinforcement, and emphasize the importance of the environment in shaping behavior. Cognitive processes and introspection are more commonly associated with other schools of psychology. Conditioned stimuli are important in classical conditioning, which is a focus of behaviorism, but not the primary emphasis.