The Electrochemical Reaction Which Powers a Lead-Acid Storage Battery Is

The electrochemical reaction which powers a lead-acid storage battery is as follows:
Pb(s) + PbO₂(s) + 4H⁺(aq) + 2SO₄^2-(aq) → 2PbSO₄(s) + 2H₂O(l)
A single cell of this battery consists of a Pb electrode and a PbO₂ electrode,each submerged in sulfuric acid.What reaction occurs at the cathode during discharge?

A) Pb(s) is reduced to PbSO₄(s) .
B) PbO₂(s) is reduced to PbSO₄(s) .
C) PbO₂(s) is oxidized to PbSO₄(s) .
D) Pb(s) is oxidized to PbSO₄(s) .
E) H⁺ is oxidized to H₂O(l) .