Statement $A$: Addition of $NH_4OH$ in the presence of excess $NH_4Cl$ to an aqueous solution of $BaCl_2$ results in the precipitation of $Ba(OH)_2$.
Reason $B$: $Ba(OH)_2$ is insoluble in water.

• A
  Both Statement $A$ and Reason $B$ are true,and Reason $B$ is the correct explanation of Statement $A$.
• B
  Both Statement $A$ and Reason $B$ are true,but Reason $B$ is not the correct explanation of Statement $A$.
• C
  Statement $A$ is true,but Reason $B$ is false.
• D
  Both Statement $A$ and Reason $B$ are false.