The correct order of $E^{\circ}_{M^{2+}/M}$ values for the four successive elements $Cr$,$Mn$,$Fe$,and $Co$ is:

  • A
    $Mn > Cr > Fe > Co$
  • B
    $Cr < Fe > Mn > Co$
  • C
    $Fe > Mn > Cr > Co$
  • D
    $Cr > Mn > Fe > Co$

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