$A$ lead storage battery is discharged. During the charging of this battery,the reaction that occurs at the anode is:

• A
  $PbSO_{4(s)} + 2e^- \rightarrow Pb_{(s)} + SO_{4(aq)}^{2-}$
• B
  $PbSO_{4(s)} + 2H_2O_{(l)} \rightarrow PbO_{2(s)} + SO_{4(aq)}^{2-} + 4H_{(aq)}^+ + 2e^-$
• C
  $PbSO_{4(s)} \rightarrow Pb_{(aq)}^{2+} + SO_{4(aq)}^{2-}$
• D
  $PbSO_{4(s)} + 2H_2O_{(l)} + 2e^- \rightarrow PbO_{2(s)} + SO_{4(aq)}^{2-} + 2H_{(aq)}^+$