The reaction that is $NOT$ involved in the ozone layer depletion mechanism in the stratosphere is

• A
  $CF_2Cl_{2(g)} \xrightarrow{hv} \dot{Cl}_{(g)} + \dot{C}F_2Cl_{(g)}$
• B
  $Cl\dot{O}_{(g)} + O_{(g)} \to \dot{Cl}_{(g)} + O_{2(g)}$
• C
  $CH_4 + 2O_3 \to 3CH_2=O + 3H_2O$
• D
  $HOCl_{(g)} \xrightarrow{hv} \dot{O}H_{(g)} + \dot{C}l_{(g)}$