Which pair of metal ions from the following has the same number of unpaired electrons?

  • A
    $Co^{2+}$ and $Mn^{3+}$
  • B
    $Mn^{2+}$ and $Zn^{2+}$
  • C
    $Fe^{3+}$ and $Mn^{2+}$
  • D
    $Sc^{3+}$ and $Co^{2+}$

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