Which statement is correct regarding enroute descent authorization?

The correct statement regarding enroute descent authorization is that it may not be terminated without pilot consent, except in emergencies. This reflects the principle that once a descent has been authorized by air traffic control, the pilot has the right to execute that descent as long as it is still within the parameters of safe operations.

In non-emergency situations, the controller can communicate changes in flight plans or other necessary adjustments, but they must respect the pilot's authorization for descent, fostering a cooperative approach between the pilot and air traffic control. This ensures that pilots maintain control over their aircraft while still coordinating with traffic management.

During emergencies, however, standard operating procedures may change, and the controller may have the authority to terminate descent authorization to ensure the safety of the flight or other aircraft involved. This procedural flexibility is critical in maintaining safety in the airspace system.