The Half-Reaction That Occurs at the Cathode During Electrolysis of Aqueous

The half-reaction that occurs at the cathode during electrolysis of aqueous CuCl₂ solution is:

A) Cl₂(g) + 2 e^- $\rarr$ 2 Cl^-(aq)
B) 2 Cl(aq) $\rarr$ Cl₂(g) + 2 e^-
C) Cu²⁺(aq) + 2 e^- $\rarr$ Cu(s)
D) Cu⁺(aq) + e^- $\rarr$ Cu(s)
E) 2 H₂O + 2 e^- $\rarr$ H₂(g) + 2 OH^-(aq)