What can be restored when the Master Power CB is pulled?

The correct response highlights the importance of the Master Power Circuit Breaker (CB) in restoring specific functions of the aircraft's systems. When the Master Power CB is pulled, it serves as a safeguard to the aircraft's electrical systems. Specifically, it can restore avionics power in the case of a failure of the Master Power Switch.

This is critical because avionics systems are essential for navigation, communication, and various other functionalities in an aircraft. If the Master Power Switch fails, pulling the Master Power CB allows for a reset and can re-establish electrical power to these vital systems, ensuring that the pilot can maintain control and gather necessary information about the aircraft's operation.

While the other options represent important systems in an aircraft, they do not specifically indicate the immediate consequence of restoring power through the Master Power CB as clearly as avionics does. Engine power, fuel system pressure, and navigation systems are affected by other components and may not necessarily be restored simply by that action.