On the surface of polar stratospheric clouds,hydrolysis of chlorine nitrate $(ClONO_2)$ gives $A$ and $B$,while its reaction with $HCl$ produces $B$ and $C$. $A, B$ and $C$ are,respectively:

• A
  $HOCl, HNO_3, Cl_2$
• B
  $Cl_2, HNO_3, HOCl$
• C
  $HClO_2, HNO_2, HOCl$
• D
  $HOCl, HNO_2, Cl_2O$