The lanthanide contraction is responsible for the fact that

  • A
    $Zr$ and $Y$ have about the same radius
  • B
    $Zr$ and $Nb$ have similar oxidation state
  • C
    $Zr$ and $Hf$ have almost the same radius
  • D
    $Zr$ and $Zn$ have the same oxidation state

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