Assertion :- On cooling ,ammonia lirquifies first whereas `CO_(2)` requires more cooling.
Reason :- Critical temperatures of ammonia and carbon dioxide are 405.5 K and 304.10 K respectively.
A. If both assertion and reason are true and reason is the correct explanation of assertion .
B. If both assertion and reason are true but reason is not the correct explanation of assertion .
C. If assertion is true but reason is false .
D. If both assertion and reason are false .
