The Following Reactions Take Place in a Lead Storage Battery

Multiple Choice

The following reactions take place in a lead storage battery.
Discharging: Pb(s) + PbO₂(s) + 4H⁺(aq) + 2SO₄^2-(aq) → 2PbSO₄(s) + 2H₂O(l)
Charging: 2PbSO₄(s) + 2H₂O(l) → Pb(s) + PbO₂(s) + 4H⁺(aq) + 2SO₄^2-(aq)
Which of the following statements is true?

A) The concentration of H₂SO₄ increases as the battery discharges.
B) Pb is formed at the anode during discharge.
C) Pb is formed at the cathode during charging.
D) The mass of Pb decreases during charging.
E) The mass of PbSO₄ remains constant during charging and discharging.