Which from the following is a correct stability order of complexes formed by metal ions if the ligand remains the same?

• A
  $Fe^{2+} > Mn^{2+} > Co^{2+}$
• B
  $Co^{2+} > Fe^{2+} > Mn^{2+}$
• C
  $Co^{2+} > Mn^{2+} > Fe^{2+}$
• D
  $Fe^{2+} > Co^{2+} > Mn^{2+}$