The tendency to form monovalent compounds among the Group $13$ elements is correctly exhibited in:

  • A
    $B < Al < Ga < In < Tl$
  • B
    $Tl < In < Ga < Al < B$
  • C
    $Tl \approx In < Ga < Al < B$
  • D
    $B \approx Al \approx Ga \approx In \approx Tl$

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