In a dry cell,the reaction which takes place at the zinc anode is:

• A
  $Zn^{2+} + 2e^- \to Zn_{(s)}$
• B
  $Zn_{(s)} \to Zn^{2+} + 2e^-$
• C
  $Mn^{2+} + 2e^- \to Mn_{(s)}$
• D
  $Mn_{(s)} \to Mn^{+} + e^- + 1.5 \ V$