Assertion (A): Enthalpy of graphite is lower than that of diamond.
Reason (R): Entropy of graphite is greater than that of diamond.
(a)If both (A) and (R)are true and (R) is the true explanation of (A).
(b) If both (A) and (R)are true but (R) is not the true explanation of (A).
(c ) If (A) is true but (R) is false.
(d) If both (A) and (R) is false.