What action should be taken if portable oxygen is required for landing?

When portable oxygen is required for landing, the appropriate action is to inform an Able-Bodied Passenger (ABP) and ensure that the captain is informed. This is crucial because the presence of oxygen for a passenger who needs it could be essential for their safety during the landing phase when cabin pressure changes might occur.

By notifying an ABP, you ensure that an attentive and capable individual can assist the passenger who needs the oxygen, while the captain can make any necessary preparations or adjustments in response to the situation. This communication is vital for maintaining safety protocols and ensuring that the crew is aware of any special requirements for disembarking passengers.

The remaining options do not appropriately address the situation: removing the mask or deactivating the oxygen could endanger the passenger in need, while seating the passenger elsewhere does not directly address the immediate requirement for oxygen during the landing. Hence, the correct procedure is to communicate effectively with both an ABP and the captain.