Identify the species having one $\pi$-bond and maximum number of canonical forms from the following :

  • [JEE MAIN 2021]
  • A

    $\mathrm{CO}_{3}^{2-}$

  • B

    $\mathrm{O}_{2}$

  • C

    $\mathrm{SO}_{2}$

  • D

    $\mathrm{SO}_{3}$

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  • [IIT 1988]

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