What Is the Acid Ionization Constant , K _a, for Chlorous

What is the acid ionization constant , K _a, for Chlorous acid, HClO₂, if a 0.25 M aqueous solution of chlorous acid has a pH equal to 1.33?
You may want to complete the ICE table before getting started. HClO₂ H₃O⁺ ClO₂^{1 -} Initial Change @ equilibrium

A) K _a = 2.2×10 ^{- 3}
B) K _a = 7.4×10 ^{- 3}
C) K _a = 8.8×10 ^{- 3}
D) K _a = 1.1×10 ^{- 2}
E) K _a = 4.7×10 ^{- 2}