Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$ : $PH_3$ has lower boiling point than $NH_3$.
Reason $(R)$ : In liquid state $NH_3$ molecules are associated through van der Waals forces,but $PH_3$ molecules are associated through hydrogen bonding.
In the light of the above statements,choose the most appropriate answer from the options given below:

• A
  Both $(A)$ and $(R)$ are correct and $(R)$ is not the correct explanation of $(A)$
• B
  $(A)$ is not correct but $(R)$ is correct
• C
  Both $(A)$ and $(R)$ are correct but $(R)$ is the correct explanation of $(A)$
• D
  $(A)$ is correct but $(R)$ is not correct