What must each passenger do during movement on the aircraft?

Each passenger must occupy an approved seat with a safety belt secured during movement on the aircraft for several important reasons related to safety regulations and the overall safety of the flight. The requirement to wear a seatbelt ensures that passengers are secured in their seats, minimizing the risk of injury during unexpected turbulence, sudden stops, or during takeoff and landing when the aircraft is under more dynamic forces.

Safety belt usage is critical for all passengers, as it helps to keep them safely aboard the aircraft and protects them from the risks associated with sudden maneuvers or emergencies. Additionally, regulations set by aviation authorities mandate that all passengers must abide by these safety protocols, emphasizing the importance of adhering to safety measures for the well-being of everyone on board.

Other options, such as remaining seated without a seatbelt or standing and moving about the cabin, do not align with established safety practices or regulations, thus reinforcing the necessity of option B as the correct choice.