What hydraulic systems are used to manually move the Terminal Horizontal Stabilizer (THS)?

The correct choice identifies that the Green and Yellow hydraulic systems are responsible for manually moving the Terminal Horizontal Stabilizer (THS) on the A320.

The Green hydraulic system primarily powers flight control surfaces and provides hydraulic pressure for various systems, while the Yellow hydraulic system is also used in flight control applications, among other functionalities. Together, they work to ensure that the THS can be adjusted manually if needed, allowing for enhanced pilot control and aircraft stability.

Understanding the specific functions of the hydraulic systems is essential, as each system has dedicated roles in aircraft operations that contribute to safety and performance. The other options involve different combinations of hydraulic systems that do not specifically pertain to the manual movement of the THS, making them less appropriate in this context.