H= energy of product minus energy of reactant
H is endothermic and positive when heat is absorbed
H is exothermic and negative when heat is released
You forgot to attach the diagram but I have an idea of what it might look like. So since the energy of reactant is at a lower level and energy of product is at a higher level, the reaction will be positive.
Answer: C. The difference of the energy of the reactants and the energy of the products.
Fossils formed when dinosaurs died