During the electrolysis of molten sodium chloride, the reaction which occurs at the cathode is

A. Na⁺ + e⁻ → Na (s)
B. Na(s) → Na⁺ + e⁻
C. 2CI⁻ → CI₂ (g) + 2e⁻
D. CI₂ (g) + 2e⁻ → 2CI⁻