During a mass casualty incident, four patients arrive simultaneously at the emergency department. Which patient should receive the highest priority for treatment according to the START triage system?
A patient who is ambulatory and has minor lacerations
A patient who is not breathing even after the airway has been repositioned
A patient with a respiratory rate of 32 breaths per minute on room air
A patient with a respiratory rate of 10 breaths per minute and is not obeying commands