Statement $A$: Calcium chloride $(CaCl_2)$ is not useful for drying alcohols or $NH_3$.
Reason $R$: $CaCl_2$ is not a good desiccant.

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