The correct answer is: C. kVAR
Static capacitors are rated in terms of kVAR, which stands for kilovolt-ampere reactive. This is a unit of reactive power, which is the part of the total power that does not produce any real work. Reactive power is used to create and maintain a magnetic field, and it is necessary for some types of electrical equipment to function properly.
kW stands for kilowatts, which is a unit of real power. Real power is the part of the total power that is used to do work. It is measured in watts, which are equal to one joule of energy per second.
kWh stands for kilowatt-hours, which is a unit of energy. Energy is the product of power and time. It is measured in kilowatt-hours, which are equal to one kilowatt of power for one hour.
None of the above is not the correct answer. Static capacitors are rated in terms of kVAR, not kW, kWh, or none of the above.