Which equipment is specifically used to provide oxygen to passengers in case of an emergency?

The correct answer is the Portable Oxygen Bottle, which is specifically designed to deliver oxygen to passengers during an in-flight emergency. In the event of a cabin depressurization or other scenarios that might compromise the availability of breathable air, the Portable Oxygen Bottle is crucial in providing supplemental oxygen to ensure that passengers can breathe comfortably and maintain their health until the situation is resolved.

Each aircraft typically carries several of these bottles, which are easy to use and can be deployed quickly by flight attendants. The effectiveness of the Portable Oxygen Bottle is essential for maintaining passenger safety since it directly addresses the concerns around hypoxia (lack of oxygen), which can occur at high altitudes.

While the other options have their purposes, they do not directly relate to providing supplemental oxygen to passengers. For instance, a Portable Electronic Device might refer to specific items that passengers can use during the flight, but they do not provide oxygen. Protective Breathing Equipment is more suited for crew use in situations like smoke-filled environments rather than for passenger oxygen supply. The Passenger Safety Unit typically encompasses a range of safety equipment but is not specifically designated for oxygen delivery.