Final answer:
The best rule among those listed is 'A. No sexual harassment,' as it ensures a safe and respectful working environment, upholds professional conduct, and prevents potential legal issues.
Step-by-step explanation:
Of the rules listed, 'A. No sexual harassment' would be considered a GOOD rule. This rule helps to maintain a safe and respectful working environment for all employees. It is designed to protect employees from offensive or inappropriate behavior and upholds a standard of professional conduct in the workplace. Ensuring a harassment-free workplace is not only morally right but also creates a more productive atmosphere and helps prevent legal issues for the company 'B. No parking in the boss's spot' might be important for maintaining order and respect within the company hierarchy, but it does not have the same broad ethical or legal implications as preventing sexual harassment. 'C. No pay checks till the boss is paid first' could be problematic from a labor rights perspective. 'D. Only one trip to the water fountain each morning' could be considered overly restrictive and potentially harmful to employee health, as it limits access to the water necessary for proper hydration throughout the workday.