Final answer:
The setting of the excerpt is a makeshift hospital without proper facilities.
Step-by-step explanation:
The correct answer is B. The excerpt describes a makeshift hospital without proper facilities. The low white tents of the hospital are grouped around an old school-house, indicating the temporary nature of the setup. The ambulances being stuck in deep mud and the commotion of injured people coming and going further highlight the improvised setting of the hospital.
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