Which of the following represents the correct increasing order of $pK_a$ values?
- A$HClO_4 < HNO_3 < H_2CO_3 < B(OH)_3$
- B$HNO_3 < HClO_4 < B(OH)_3 < H_2CO_3$
- C$B(OH)_3 < H_2CO_3 < HClO_4 < HNO_3$
- D$HClO_4 < HNO_3 < B(OH)_3 < H_2CO_3$
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