In a certain chemical reaction, the bonds of the products contain more energy than the bonds of the reactants. For the reaction to occur, which of the following best describes what occurred?
A. Energy was added, so the reaction is endothermic.
B. Energy was added, so the reaction is exothermic
C. Energy was released, so the reaction is exothermic.
D. Energy was released, so the reaction is endothermic.