In this question, we have to determine which side has a higher potential energy and are more or less stable. In an endothermic reaction, which is the opposite of exothermic reaction, the side which has bonds being broken, this is the side where we can find more potential energy, since this potential energy is the source of energy, and for endothermic reactions, the products will present this characteristic. Potential energy will also influence the stability of the reaction, exothermic reactions are not very stable, as they release energy to the surroundings. Therefore since endothermic reactions are the opposite of exothermic reactions, we can treat it like that, therefore products will be higher in potential energy and will be less stable. Letter C