In the reaction $HC_2O_4^{-} + PO_4^{3-} \rightarrow HPO_4^{2-} + C_2O_4^{2-}$,which are the two Brønsted bases?

  • A
    $HC_2O_4^{-}$ and $PO_4^{3-}$
  • B
    $HPO_4^{2-}$ and $C_2O_4^{2-}$
  • C
    $PO_4^{3-}$ and $C_2O_4^{2-}$
  • D
    $HC_2O_4^{-}$ and $HPO_4^{2-}$

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