Final answer:
In a triage situation, the patient who should be assessed first is the one with the highest level of acuity or severity of injury.
Step-by-step explanation:
In a triage situation when dealing with immediate deaths from trauma, the patient who should be assessed first is the one with the highest level of acuity or severity of injury. Based on the options given, the patient with the most severe condition is the 22-year-old patient who is experiencing immediate deaths from trauma.