Which of the elements possess only one electron in the $5d$-orbital?

  • A
    $^{69}Tm, ^{61}Pm$
  • B
    $^{59}Pr, ^{71}Lu$
  • C
    $^{57}La, ^{61}Pm$
  • D
    $^{57}La, ^{71}Lu$

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