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You are triaging patients from a multi-casualty incident. The following patients are seen:

Patient A: Approximately 2 years old, ambulatory, crying, large 8cm parietal hematoma, obvious right humeral deformity

Patient B: Approximately 5 years old, unresponsive, apneic after airway positioning and 5 rescue breaths, weak palpable pulse

Patient C: Approximately 3 years old, responsive to painful stimuli, breathing at 40 breaths per minute, very weak palpable pulse

Patient D: Approximately 7 years old, unresponsive, breathing at 30 breaths per minute, weak palpable pulse

Which patient receives first priority?