Refer to figure.
The Alert Messages system continuously monitors a large number of inputs from engine and airframe systems sensors and will detect any malfunctioning of systems.

If this should occur, then appropriate messages are generated and displayed on the upper display unit in a sequence corresponding to the level of urgency of action to be taken.

Level A - Warning requiring immediate corrective action. They are displayed in red. Master warning lights are also illuminated, and aural warnings (e.g. fire bell) from a central warning system are given.

Level B - Cautions require immediate crew awareness and future crew action. They are displayed in amber, and also by message caution lights. An aural tone is also repeated twice.

Level C - Advisories requiring crew awareness. Also displayed in amber. No caution lights or aural tones are associated with this level.

From the options given, only an engine failure would require immediate crew action/awareness, thus the rest of the messages could be displayed as an advisory.