For Which of the Following Equilibria Does K_c Correspond to a Base-Ionization

Multiple Choice

For which of the following equilibria does K_c correspond to a base-ionization constant,K_b?

A) H₃O⁺(aq) + OH^-(aq) 2H₂O(l)
B) HCO₃^-(aq) + OH^-(aq) CO₃^2-(aq) + H₂O(l)
C) HOCl(aq) + H₂O(l) H₃O⁺(aq) + OCl^-(aq)
D) CO₃^2-(aq) + H₂O(l) HCO₃^-(aq) + OH^-(aq)
E) HCHO₂(aq) + NH₃(aq) CHO₂^-(aq) + NH₄⁺(aq)