What does the EPS BUS power in the aircraft?

The EPS BUS, or Emergency Power Supply Bus, is critical in providing power to essential systems in the aircraft during abnormal situations where normal power sources may fail. The correct answer identifies that this bus powers systems crucial for maintaining the safety and operational capability of the aircraft, specifically the Electronic Standby Instrument System (ESIS), the Centralized Processing and Control System (CPCS), and the oxygen system.

The ESIS is important for providing the pilot with essential flight data in case the primary instruments fail, ensuring continued situational awareness. The CPCS plays a role in monitoring and controlling multiple aircraft systems and systems safety functions. Additionally, the oxygen system is vital for passenger and crew safety at altitude, particularly in the event of cabin depressurization. Ensuring these systems are operational can be lifesaving in emergency scenarios, making the EPS BUS a key component in the aircraft's design for safety and redundancy.

Other choices, while they represent important aircraft systems, do not correctly describe the specific functions of the EPS BUS. The lighting system and fuel indications, avionics and navigation systems, as well as flight control systems and autopilot, are typically managed by different power sources and systems within the aircraft architecture, hence they are not powered by the EPS BUS.