Hello! Can you please answer this economics question? Thank you!

Question 2 The warehouse needs the trucks loaded by 5:00 AM every morning, but the workers, who get paid by the hour claim, that they can't load the trucks that fast, even though the supervisor sees them taking a lot of breaks and moving slowly throughout the night. This is most clearly an example of 0 Fixed Costs 0 The Law of Increasing Marginal Productivity O Sunk Costs O The PrincipleAgent