80. The scheme describes the catalytic hydrogenation pathway of 1-butene to butane. Which of the following statements below correctly shows the steps? (A) (X)-oxidative addition, (Y)-reductive elimination, (Z)- ligand association (B) (X)-ligand association, (Y)-reductive elimination, (Z)-oxidative addition (C) (X)-reductive elimination, (Y)- oxidative addition, (Z)-ligand association (D) (X)-reductive elimination, (Y)-ligand association, (Z)-oxidative addition (E) (X)- ligand association, (Y)- oxidative addition, (Z)-reductive elimination