Statement: A catayst does not affect the heat of reaction.
Explanation: It increases the rate of reaction.
A. (a) `S` is correct but `E` is wrong
B. (b) `S` is wrong but `E` is correct
C. (c ) Both `S` and `E` are correct and `E` is correct explanation of `S`
D. (d) Both `S` and `E` are correct but `E` is not correct explanation of `S`.