Final answer:
The question is about evaluating rehab effectiveness at structure fires and the primary focus of the ISO.
Step-by-step explanation:
The subject of this question is Health. The question is asking about the factors that the ISO needs to focus on in order to evaluate the effectiveness of rehab at structure fires. The correct answer is A) Critical Assignments. Firefighters have been known to disregard the effects of heat, physical exertion, and weather exposure if there are still critical assignments left to accomplish.