The current flow through electrolyte is due to the migration of:
(A) Electron
(B) Proton
(C) Ion
(D) Hole

Hint :When dissolved in a polar solvent, such as water, an electrolyte generates an electrically conducting solution. The electrolyte in solution separates into cations and anions, which spread evenly throughout the solvent. Such a solution is electrically neutral.

Complete Step By Step Answer:
A charged particle moves through an electrolyte to an electrode with the opposite charge sign. During the passage of an electric current, losses in a neutral salt surrounding two electrodes are proportional to the velocities of ions migrating from these electrodes. The ionic chemicals contained in the electrolyte that are present as ions in the electrolyte migrate towards various electrodes with their charge in electrolysis, facilitating current flow. As a result, ions are the source of current in electrolysis. The quantity of electrical energy that must be provided is equal to the reaction's change in Gibbs free energy plus the system's losses. Because the losses might be arbitrarily near to zero (in principle), the greatest thermodynamic efficiency equals the enthalpy change divided by the reaction's free energy change. Because the electric input is usually greater than the reaction's enthalpy change, some energy is dissipated as heat. In some circumstances, such as high-temperature electrolysis of steam to produce hydrogen and oxygen, the converse is true, and heat energy is absorbed.
Hence option C is correct.

Note :
An electrolytic cell is an electrochemical cell that drives a non-spontaneous redox reaction with electrical energy. Electrolysis—the Greek term lysis means "to break up"—is frequently employed to break down chemical substances. Electrolysis is used to break down water into hydrogen and oxygen, as well as bauxite into aluminium and other compounds.