Assertion (A): Decomposition of vegetable matter into compost is an endothermic reaction.
Reason (R): Decomposition reaction involves the breakdown of a single reactant into simpler products.
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.