When ethanol is reacted with $PCl_5$,it gives $A$,$POCl_3$,and $HCl$. Compound $A$ reacts with silver nitrite to give the major product $B$ and $AgCl$. What are $A$ and $B$ respectively?

• A
  $C_2H_5Cl$ and $C_2H_5OC_2H_5$
• B
  $C_2H_6$ and $C_2H_5OC_2H_5$
• C
  $C_2H_5Cl$ and $C_2H_5NO_2$
• D
  $C_2H_6$ and $C_2H_5NO_2$