Assertion (A) :  $P{H}_3$ has higher boiling point than $N{H}_3$  
Reason (R): In Liquid state $N{H}_3$  molecules associated through hydrogen bond, but in $P{H}_3$ molecules associated through Vanderwaal's forces.

Both A and R are correct and R is the correct explanation of A

A is correct but R is not correct

A is not correct but R is correct

Both A and R are correct but R is not the correct explanation of A