Assertion (A): A decrease in Gibbs free energy at constant temperature and pressure provides a criterion of spontaneity. Reason (R): A spontaneous change must have a positive value of $\Delta G_{system}$.
- ABoth Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
- BBoth Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
- CAssertion (A) is true, but Reason (R) is false.
- DAssertion (A) is false, but Reason (R) is true.
✓ Correct answer: C
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