Which of the following series of transition metal ions all have a $3d^2$ electronic configuration?

  • A
    $Ti^{3+}, V^{2+}, Cr^{3+}, Mn^{4+}$
  • B
    $Ti^{+}, V^{4+}, Cr^{6+}, Mn^{7+}$
  • C
    $Ti^{4+}, V^{4+}, Cr^{2+}, Mn^{3+}$
  • D
    $Ti^{2+}, V^{3+}, Cr^{4+}, Mn^{5+}$

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