In the presence of a catalyst, the heat evolved or absorbed during the reaction __________.

In the presence of a catalyst the Gibbs free energy does not change as the energy difference between reactant and product remains the same.

A reference can be taken from the above graph that final product AB energy and the reactants (A and B) energies are the same in the absence and the presence of catalyst remains the same in the presence or absence of a catalyst.

Thus option (iii) is correct.