Final answer:
The appropriate action to take upon arrival at the scene of a multiple vehicle crash.
Step-by-step explanation:
The subject of this question is Health.
Among the given options, the action that is NOT appropriate upon arrival at the scene of a multiple vehicle crash is (B) treat and transport the most critically ill patient.
While it is important to provide immediate medical attention to those in need, it is crucial to first establish scene command, perform a scene size up, and control scene hazards before addressing individual patients.