So,
In an endothermic reaction, the reaction requires a determined amount of energy to occurs.
The reaction of the problem has H = -600kJ/mol. The reaction is endothermic and the energy that the reaction needs is absorbed by the reactants. That means, the energy of products. Then, the correct answer is:
It is greater than -600kJ/mol because the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.