What must be ensured in the case of an emergency evacuation?

In the context of an emergency evacuation, the focus is primarily on the safety of the children. The correct option emphasizes that no pupil can be sent off until they are accounted for and properly processed through the evacuation procedures. This includes ensuring that all children are gathered in a safe location and a headcount is performed to verify everyone is present.

This protocol is crucial for maintaining safety during an emergency situation. Sending students off into potentially unsafe conditions or without proper supervision could lead to confusion and risk. It is essential that a structured evacuation process is followed to ensure every child is cared for and accounted for before taking further actions, such as notifying parents or moving to a different location.

While other options may suggest actions that relate to communication or protocols, they do not prioritize the immediate safety and verification of all children involved during the chaotic nature of an emergency evacuation.