Identify the incorrect statement among the following.

  • A
    $d$-block elements show irregular behavior compared to their groups.
  • B
    $La$ and $Lu$ have partially filled orbitals and no other partially filled orbitals.
  • C
    The behavior of different lanthanoids is almost similar.
  • D
    $4f$ and $5f$ orbitals provide similar shielding effects.

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