The Half-Reaction Occurring at the Cathode During Electrolysis of an Aqueous

The half-reaction occurring at the cathode during electrolysis of an aqueous copper(II) iodide solution is

A) I₂ + 2e^- $\rarr$ 2I^-.
B) Cu $\rarr$ Cu²⁺ + 2e^-.
C) Cu²⁺ + 2e^- $\rarr$ Cu.
D) 2I^- $\rarr$ I₂ + 2e^-.
E) 2e^- + 2H₂O $\rarr$ H₂ + 2OH^-.