Given below are two statements labeled as Assertion (A) and Reason (R)
Assertion: At high pressure, decomposition of ammonia on the catalyst surface is a first order reaction.
Reason: At high pressure, on changing the reaction conditions, the concentration of ammonia on the surface of the catalyst does not change.
Select the most appropriate answer from the options given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.