The primary focus of behaviorism in education is:

The primary focus of behaviorism in education is observable behavior. Behaviorism, as a psychological theory, posits that learning occurs through interactions with the environment, and that behaviors can be shaped through conditioning, reinforcement, and punishment. It emphasizes what can be seen and measured, rather than internal mental states.

• Internal thought processes (A) are the focus of cognitive psychology.
• Emotional development (C) is a broader aspect of human development, not the central tenet of behaviorism.
• Social interactions (D) are central to constructivist theories like Vygotsky's sociocultural theory, not behaviorism.