What is the reduction half-reaction for the following overall galvanic cell reaction?
Pb²⁺1 aq) + 2 Cu( s) - Pb( s) + 2 Cu⁺(aq)
A. Pb²⁺(aq) + e⁻ → Pb(s)
B. Cu⁺(aq) + e⁻ →Cu(s)
C. Pb²⁺(aq) + 2 e⁻ → Pb(s)
D. Cu(s) + e - Cu⁻ → (aq)