For the Reaction Given Below, Which Half Reaction Occurs at the Cathode?Pb(s)

For the reaction given below, which half reaction occurs at the cathode?Pb(s) + PbO₂(s) + 2HSO₄^-(aq) + 2H₃O⁺(aq) $\rarr$ 2PbSO₄(aq) +4H₂O(l)

A) Pb $\rarr$ PbSO₄
B) PbO₂ $\rarr$ PbSO₄
C) HSO₄^- $\rarr$ PbSO₄
D) H₃O⁺ $\rarr$ H₂O
E) PbSO₄ $\rarr$ PbO₂