In an endothermic reaction, energy is absorbed from the surroundings, which means that the total energy absorbed in breaking bonds in the reactants is greater than the energy released when new bonds are formed in the products.
The correct statement that must be true if a relationship is endothermic is:
More bond energy is absorbed on the reactant side than released on the product side.
This reflects that the energy required to break the bonds in the reactants exceeds the energy released when new bonds are formed in the products.