Identify the conjugate bases of $H_3PO_3$ and $H_2SO_4$ respectively from the following.
- A$HPO_3^{2-}$ and $SO_4^{2-}$
- B$HPO_3^{2-}$ and $HSO_4^-$
- C$H_2PO_3^-$ and $HSO_4^-$
- D$PO_3^{3-}$ and $SO_4^{2-}$
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