An inorganic white crystalline compound $(A)$ has a rock salt structure. $(A)$ on reaction with conc. $H_2SO_4$ and $MnO_2$ evolves a pungent smelling,greenish-yellow gas $(B)$. Compound $(A)$ gives a white precipitate of $(C)$ with $AgNO_3$ solution. Compounds $(A)$,$(B)$,and $(C)$ will be respectively:

• A
  $NaCl, Cl_2, AgCl$
• B
  $NaBr, Br_2, NaBr$
• C
  $NaCl, Cl_2, Ag_2SO_4$
• D
  $Na_2CO_3, CO_2, Ag_2CO_3$