Final answer:
The correct answer is allowing passengers to ride on the a. bow or stern while underway is reckless operation because it puts passengers at risk of being thrown overboard and impedes the operator's control.
Step-by-step explanation:
Allowing passengers to ride on the a. bow or stern while underway is reckless operation. It is considered unsafe because passengers could easily be thrown overboard due to waves, wake from other vessels, or sudden movements of the boat.
Additionally, riding on these areas of a boat can hinder the operator's visibility and ability to control the boat safely. It is important to always follow safety guidelines and regulations when on the water to prevent accidents and ensure the safety of all passengers and crew.