Answer: The correct answer is "electromotive force".
Step-by-step explanation:
If the battery is connected to the conductor which makes the flow of the electric charge. Battery forces the charges to flow. The rate of flow of charges constitutes the electric current.
The electromotive force is required for an electric charge to flow through a wire. Here, it is provided by the battery.
Battery allows the flow of electrons between cathode and anode. The cathode is at lower potential and the anode is at higher potential. The charges flow from lower potential to the higher potential.
Therefore, battery is required which provides electromotive force for an electric charges to flow through a wire.