The potential energy of the reactants from the energy diagram you sent is +200 kJ. So the option A is correct.
Potential energy is a form of energy that an object possesses due to its position or state. It is stored energy that has the potential to do work. The concept of potential energy is often used in the context of physics and mechanics.
The potential energy of the reactants from the energy diagram you sent is +200 kJ. This is the y-intercept of the line representing the potential energy of the reactants, before the reaction begins.
The other answer choices are incorrect because they are either higher or lower than the actual potential energy of the reactants.
Note that the potential energy of the reactants must be positive, because it takes energy to break the bonds in the reactants and form new bonds in the products.