The Reduction Half Reaction Occurring in the Standard Hydrogen Electrode

Multiple Choice

The reduction half reaction occurring in the standard hydrogen electrode is ________.

A) H₂ (g, 1 atm) → 2H⁺ (aq, 1M) + 2e^-
B) 2H⁺ (aq) + 2OH^- → H₂O (l)
C) O₂ (g) + 4H⁺ (aq) + 4e^- → 2H₂O (l)
D) 2H⁺ (aq, 1M) + 2e^- → H₂ (g, 1 atm)
E) 2H⁺ (aq, 1M) + Cl₂ (aq) → 2HCl (aq)