If the AG of a reaction was -31.45 kJoules, you would know that: A. the products have more free energy than the reactants.
B. the reaction requires an energy input of 31.45 kJoules to proceed.
C. the reaction most likely leads to development of a more ordered system
D. the reaction is spontaneous

The correct answer is - option D. the reaction is spontaneous. (considering it as delta G or ΔG)

Explanation:

If a chemical reaction has a negative ∆G it means the reactants have more free energy than the products due to the fact that they give off some of their free energy during the reaction.

Such reactions release free energy and therefore called exergonic reactions. These reactions are also known as spontaneous reactions as they do not require energy to take place.

Thus, the correct answer is - option D.