Final answer:
A) Red warning alert is activated. If a pilot fails to respond to the amber caution alert for CAUTION TERRAIN or CAUTION OBSTACLE, the red warning alert is activated. The warning alert is more severe and urgent than the caution alert, indicating an immediate danger. It is important for pilots to pay attention to and respond appropriately to all alerts and warnings in order to ensure the safety of the aircraft and its passengers.
Step-by-step explanation:
If a pilot fails to respond to the amber caution alert for CAUTION TERRAIN or CAUTION OBSTACLE, the red warning alert is activated, not the auto-pilot. The warning alert is more severe and urgent than the caution alert, indicating an immediate danger. It is designed to grab the pilot's attention and prompt immediate action to avoid the potential hazard.
The engine does not shut down in this situation, as the warning is primarily meant to be a visual stimulus for the pilot. It is important for pilots to pay attention to and respond appropriately to all alerts and warnings in order to ensure the safety of the aircraft and its passengers.
In summary, if a pilot fails to respond to the amber caution alert for CAUTION TERRAIN or CAUTION OBSTACLE, the red warning alert is activated instead of the auto-pilot engaging, the engine shutting down, or the system resetting the caution alert.