Electromotive force of a battery represents
A. force
B. energy
C. electric potential energy per unit charge
D. current

Hint: The general formula for EMF is \[\dfrac{{\text{w}}}{{\text{q}}}\] and the unit of EMF is \[{\text{J/c}}\] or volt.

Complete step by step solution:
The electromotive force (EMF) is energy per unit charge that is imported by an energy source, such as an electric generator or a battery. Energy is converted from one form to another in the generator or battery as the device does work on the electric charge being transferred of electromotive force is E or EMF.
Another way to explain the electromotive force (E or EMF) is the energy provided by a cell or battery per coulomb of charge passing through it, it is equal to the potential difference across the terminals of the cell when no current is flowing through it.

Hence, option (C) is correct.

Additional Information: The man who coined the term electromotive force was Alessandro Volta, who stated that there was a force separating the charge in current flowing in a closed circuit flowing in a closed circuit. He then named this, free, as a result his last name is forever attached to the EMF (Electromotive force) as its unit, the volt.

Note: 1. The difference between the EMF (Electromotive force) and voltage is that the intensity of EMF is constant whereas the intensity of voltage is not constant.
2. The devices that can provide EMF include electrochemical cells, thermoelectric devices, solar cells, photodiodes, electrical generators (including van de Graff generators) and even transformers. In nature, EMF is generated or produced when magnetic field fluctuations occur through a surface.