If $\alpha = \binom{m}{2}$,then $\binom{\alpha}{2} = \dots$

  • A
    $\binom{m+1}{4}$
  • B
    $\binom{m-1}{4}$
  • C
    $3 \binom{m+2}{4}$
  • D
    $3 \binom{m+1}{4}$

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