For an exothermic reaction, what would the potential energy diagram most likely look like? a curve with a negative slope indicating that the activation energy has a negative value a curve indicating that the amount of energy absorbed during the reaction is high a curve indicating that the potential energy of the reactants is higher than that of the products a curve indicating that the potential energy of the products is higher than that of the reactants

Answer is: a curve indicating that the potential energy of the reactants is higher than that of the products.
Difference between potencial energies is released usually as a heat.
There are two types of reaction: endothermic reaction (chemical reaction that absorbs more energy than it releases) and exothermic reaction (chemical reaction that releases more energy than it absorbs).

For an exothermic reaction, the potential energy diagram is most likely to be a curve with a negative slope indicating that the activation energy has a negative value. An exothermic reaction is a reaction in which energy is given off, or, in other words, a reaction that has a ΔH < 0. On the other hand, an endothermic reaction the energy diagram will be a curve with a positive slope indicating that there is a positive value in the activation energy. In this type of reaction energy is absorbed in the reaction from the environment.