Which Is the Half-Reaction at the Cathode in a Lead

Multiple Choice

Which is the half-reaction at the cathode in a lead storage battery?

A) Pb(s) + PbO₂(s) + 4H⁺(aq) + 2SO₄^2-(aq) → 2PbSO₄(s) + 2H₂O(l)
B) PbO₂(s) + 4H⁺(aq) + 2SO₄^2-(aq) + 2e^- → PbSO₄(s) + 2H₂O(l)
C) Pb(s) + SO₄^2-(aq) → PbSO₄(s) + 2e^-
D) Pb(s) → Pb(s) + 2e^-
E) H₂(g) → 2H⁺(aq) + 2e^-