A.Fe3+>Al3+>Ca2+>Mg2+>K+>Na+>H+ B.H+>Fe3+>Al3+>Ca2+>Mg2+>K+>Na+ C.H+>Na+>K+>Mg2+>Ca2+>Al3+>Fe3+ D.Fe3+>Al3+>Ca2+>Mg2+>H+>Na+>K+