What are the main components of an aircraft's hydraulic system?

The main components of an aircraft's hydraulic system are indeed the reservoir, pumps, piping, actuators, and valves. This system is crucial for operating various aircraft functions, including controlling flight surfaces, landing gear deployment, and braking systems.

The reservoir holds the hydraulic fluid necessary for the operation of the system. Pumps are essential for moving this fluid through the system and creating the pressure needed to activate the actuators. Piping is the conduit through which the hydraulic fluid travels, connecting different components of the system. Actuators convert the hydraulic pressure into mechanical motion, performing tasks such as moving flaps or controlling the landing gear. Finally, valves regulate the flow and pressure of the hydraulic fluid, ensuring that different parts of the system work effectively and safely.

Understanding these components is fundamental to grasping how hydraulic systems support aircraft operations, making answer B the correct choice.