For an oxygen delivery system to be considered appropriate for emergencies, what is the minimum flow rate and duration required?

For an oxygen delivery system to be considered appropriate for emergencies, it is essential that it can provide a sufficient flow rate and duration to ensure the patient receives enough oxygen during a critical situation. A flow rate of 6 liters per minute is generally deemed adequate to deliver sufficient oxygen to support a patient in need. Coupled with a duration of 15 minutes, this allows for a substantial oxygen supply during emergencies, especially considering that many emergency situations require immediate and effective intervention to stabilize the patient.

Maintaining a flow rate of 6 liters per minute ensures that the oxygen delivery is both efficient and effective, while the duration of 15 minutes provides a significant window to address the emergency and implement further medical care if necessary. This balance between flow rate and duration makes option B the most suitable choice for emergency oxygen delivery.