Final answer:
John Morreall believes that humor can increase morale and productivity in the workplace, and many studies support this view.
Step-by-step explanation:
According to John Morreall's perspective on humor in the workplace, Option 1 is true: many studies have been done to see if humor can increase morale and productivity. This aligns with the idea that humor helps relieve tension and fosters a sense of unity, which can contribute positively to the work environment. Morreall's understanding is supported by broader research in organizational psychology, indicating that psychological and social factors play crucial roles in workplace dynamics.