At a particular concentration, an aqueous solution of bromous acid (HBrO₂, K_a = 1.2 x 10^-5) is 3.9% ionized. Apart from the water molecules, what species is present in the highest concentration?

BrO₂^-(aq) + H₃O⁺(aq) HBrO₂(aq) + H₂O(l)

A. The hydronium ions, H₃O⁺

B. The molecular form of the acid, HBrO₂

C. The ionized form of the acid, BrO₂^-

D. There are equal amounts of HBrO₂ and BrO₂^-