Which reaction occurs at the cathode of a galvanic cell that has an aluminum electron in an electrolyte with aluminum ions in copper electrode in electrolyte with copper ions? The reduction potential for the reduction of Cu^2+ =0.34 V. The reduction potential for the reduction of Al^3+ = -1.68. A. Cu^2+(aq) + 2e- -> Cu(s) B. Cu(s) -> Cu^2+(aq) + 2e- C. Al^3+(aq) + 3e- -> Al(s) D. Al(s) -> Al^3+(aq) + 3e-