Which component shuts off during fording?

The fan shuts off during fording because it is designed to prevent water from being drawn into the engine compartment, which could lead to water contamination and potential damage. In fording situations, the vehicle enters deep water, and keeping the fan operational could result in splashes that carry water into critical engine components. By shutting off the fan, the vehicle can mitigate the risk of damage and maintain operational integrity during water crossings.

In contrast, the fuel pump, electricity supply, and engine are essential components that need to remain functional for the vehicle to operate. Shutting them off would hinder the vehicle's ability to move and navigate effectively. Therefore, the fan's operation is specifically adapted to address the unique challenges posed by fording, making it the correct answer in this context.