Describe the emergency oxygen system in the ERJ-145.

The emergency oxygen system in the ERJ-145 is designed primarily for passenger safety in case of cabin depressurization. This system automatically provides supplemental oxygen to passengers, ensuring that they have adequate oxygen during an emergency situation when the cabin altitude becomes uncomfortably high or oxygen levels are insufficient. It is crucial for maintaining passenger safety and comfort, allowing them to breathe normally until the aircraft descends to a safer altitude where supplemental oxygen is not required.

While other options may touch on aspects of the oxygen system, none accurately capture its primary function regarding passenger safety during depressurization events. The system is designed to activate without crew input only in specific scenarios, but the key feature is its provision of oxygen to the passengers, which is vital for their survival and well-being in emergencies.