Given the following $K_a$ values,determine which species is the strongest base: $HSO_4^- = 1.2 \times 10^{-2}$,$H_2PO_4^- = 6.3 \times 10^{-8}$,$HCO_3^- = 4.7 \times 10^{-11}$.
- A$CO_3^{2-}$
- B$H_2SO_4$
- C$SO_4^{2-}$
- D$HPO_4^{2-}$
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