Which factor is critical for ensuring the safety of passengers aboard a boat?

Adherence to maritime laws and regulations is critical for ensuring the safety of passengers aboard a boat because these laws and regulations are designed to protect the well-being of everyone on the water. They encompass a wide range of safety measures, including proper vessel operation, equipment requirements, and navigational rules, which help prevent accidents and ensure safe boating practices. Compliance with these regulations not only promotes safety but also reduces the risk of legal liabilities for the captain and crew.

The other factors, while they might contribute to an enjoyable outing, do not directly address safety in the same way. For instance, keeping doors open can create hazards on the boat, and ensuring a good supply of drinks might enhance comfort but does not impact safety. Limiting the number of passengers is important but is often a part of the regulations rather than a standalone safety measure. Thus, maintaining adherence to established maritime laws is the most effective way to prioritize safety for all onboard.