Which of the following pairs of transition metal ions have the same calculated values of magnetic moment?

• A
  $Ti^{2+}$ and $V^{2+}$
• B
  $Fe^{2+}$ and $Cu^{2+}$
• C
  $Cr^{2+}$ and $Fe^{2+}$
• D
  $Co^{2+}$ and $Ti^{2+}$