Which of the following statements is wrong

• A.        Catalysts can aid a rapid reaching of the equilibrium position, but do not change the position of the equilibrium
• B.        Homogeneous catalysis generally involves an equilibrium reaction between at least one of the reactants and the catalyst
• C.        Heterogeneous catalysis involves chemisorption on the surface of the catalyst
• D.        Positive catalysts raise the energy of activation of the reaction they catalyse