How can you tell if an element has been reduced? O A. The number of its electrons has not changed in the reaction.
B. It has more electrons in the product than in the reactant.
O C. It has fewer electrons in the product than in the reactant
D. It has a positive oxidation state in the product.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

the answer is a for sure mark brainliest i had got this right on usatestprep