What Is the Base Ionization Constant , K _b, for ClO₂¹

What is the base ionization constant , K _b, for ClO₂^{1 -} if the acid ionization constant, K _a, of HClO₂ equals 1.1×10 ^{- 2}?

A) K _b = 1.1×10 ^{- 16}
B) K _b = 9.1×10 ^{- 13}
C) K _b = 1.1×10 ^{- 2}
D) K _b = 9.1×10¹
E) K _b = 1.1×10¹²