Which Acid Listed Below Would Be the Strongest Given the Corresponding

Multiple Choice

Which acid listed below would be the strongest given the corresponding base ionization constants for their conjugate bases?

A) H₃PO₄; K _b(H₂PO₄^{1 -} ) = 1.4×10 ^{- 12}
B) H₂S; K _b(HS ^- ) = 1.1×10 ^{- 7}
C) HClO₂; K _b(ClO₂ ^- ) = 9.1×10 ^{- 13}
D) HNO₂; K _b(NO₂ ^- ) = 1.4×10 ^{- 11}
E) HIO; K _b(IO ^- ) = 4.3×10 ^{- 4}