Answer:
D
Step-by-step explanation:
The left side of the graph is the reactants, C(s)+2S(s). The right side of the graph is the product, CS₂(l). Adding energy to the reactants will yield the product, so the product must have more energy than the reactants. Therefore, the answer must be D.
When energy is absorbed by a reaction rather than released, it's called an endothermic reaction.