The master caution light serves to indicate:

• A. Normal electrical system status
• B. A general engine fault
• C. An electrical fault requiring pilot attention
• D. A cabin pressurization problem

Answer: (C)

The master caution light alerts you to a fault that needs pilot attention, not an immediate emergency. When it comes on, it signals that something has gone out of the ordinary and should be checked—often an electrical fault or another system issue—so you can consult the cockpit warning system (like the ECAM or system display) and follow the appropriate procedures. It’s amber, indicating attention is required but not an instant danger, unlike a master warning which is red and demands immediate action. This makes the option describing an electrical fault requiring pilot attention the best fit, since it captures the idea of a fault that needs investigation and action without implying an outright emergency.