Final answer:
B.F. Skinner is most in agreement with John Watson on the issue of internal mental events.
Step-by-step explanation:
B.F. Skinner is most in agreement with John Watson on the issue of internal mental events. Both Skinner and Watson were behaviorists who focused on studying behavior as the outcome of observable and measurable actions, rather than focusing on internal mental processes. They believed that behavior could be explained and predicted by understanding how it was influenced by external stimuli and reinforcement or punishment.