The correct answer is D. Any of the above.
A prime mover is a machine that converts energy from one form to another, typically mechanical energy to electrical energy. Different generating stations use different prime movers, depending on the type of energy source available and the desired output power.
Diesel engines are internal combustion engines that use diesel fuel to generate power. They are often used in small generating stations because they are relatively efficient and reliable.
Hydraulic turbines are machines that use the energy of moving water to generate electricity. They are often used in large generating stations that are located near rivers or other bodies of water.
Gas turbines are internal combustion engines that use natural gas or other gaseous fuels to generate power. They are often used in large generating stations because they are efficient and can be started and stopped quickly.
In addition to these three types of prime movers, there are a number of other types that are used in generating stations, including steam turbines, wind turbines, and solar photovoltaic cells. The type of prime mover that is used in a particular generating station will depend on a number of factors, including the availability of energy resources, the desired output power, and the cost of the prime mover.