The correct answer is C. kWh.
An induction type single phase energy meter is a device that measures the electric energy consumed by an electrical load. It does this by measuring the current and voltage flowing through the load and multiplying them together. The product of the current and voltage is the power, which is then integrated over time to give the energy consumed.
The energy is measured in kilowatt-hours (kWh). One kWh is equal to one kilowatt of power consumed for one hour. A kilowatt is equal to 1,000 watts. A watt is a unit of power equal to one joule of energy per second.
The other options are incorrect. kW is a unit of power, not energy. Wh is a unit of energy, but it is not the unit used by induction type single phase energy meters. VAR is a unit of reactive power, which is not the same as real power.