Final answer:
The Emergency Coordinator must approve all emergency purchases that are incurred after business hours.
Step-by-step explanation:
The correct answer is C. Emergency Coordinator. The Emergency Coordinator is responsible for overseeing emergency management and response activities within an organization. In the scenario described, emergency purchases that occur after business hours would require approval from the Emergency Coordinator, as they are responsible for coordinating and authorizing actions taken during emergencies. The City Council (option A) is typically responsible for making decisions related to laws and ordinances within a city, and would not be directly involved in emergency purchases. The Shift Supervisor (option B) and On-call Supervisor (option D) may have authority over day-to-day operations but may not have the specific authority to approve emergency purchases.