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.