The correct answer is:
D. It can never be exceeded.
The U.S. Coast Guard regulations are explicit about the importance of adhering to the Maximum Person Capacity (MPC) and Maximum Gross Load capacities for vessels. These limits are established to ensure safety and stability under normal operating conditions. Exceeding the MPC compromises the vessel's stability, increases the risk of capsizing, and can result in serious safety hazards. Therefore, these limits must always be followed without exception.