Final answer:
The correct statement by a student about disaster response, indicating successful learning, is that the disaster plan should be activated when expected casualties exceed local resource capabilities.
Step-by-step explanation:
The statement that indicates the teaching on disasters has been successful is C. "The disaster response plan should be activated when the number of casualties expected exceeds the usual resource capabilities." This recognizes the significance of scaling up the disaster response when an event overcomes local healthcare abilities. Disasters can be both internal, such as a hospital fire, and external, like natural disasters, which may include hurricanes, earthquakes, and tsunamis. These events test the limits of local healthcare and emergency services, and require a robust and preemptive approach in disaster management. The successful student understands that prompt activation of the disaster response plan is crucial when facing a high number of casualties that may exhaust available resources.