Assertion (A): Oxidation of ketones is easier than (R): C-C bond of ketones is stronger than C-H bond of aldehydes.

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.