It is important for scientists to know how much energy is given off or absorbed in a chemical reaction. Which options below would indicate an exothermic reaction? mr001-1. Jpgh = – mr001-2. Jpgh = + energy is considered a reactant in the reaction: a + b + energy mr001-3. Jpg c + d energy is considered a product in the reaction: a + b mr001-4. Jpg c + d + energy energy is released in the reaction. Energy is absorbed in the reaction.