The potential difference, often denoted as V or ΔV, is the voltage or electric potential difference between two points in an electric circuit.
EMF is not a force in the traditional sense but rather a potential that can drive an electric current in a circuit.
Internal potential energy is all of the energy in a system, excluding kinetic energy and any energy exerted by forces that contain the system.
The electric potential set across the terminals of a battery is known as terminal potential difference or terminal voltage.
The electric potential set across the terminals of a battery is known as terminal potential difference or terminal voltage.
Hence, option D is correct.