Which One of the Following Equations Represents the Ionization of a Weak

Multiple Choice

Which one of the following equations represents the ionization of a weak monoprotic acid in water

A) HCN(aq) + H₂O(l) $\leftrightharpoons$ H₃O⁺(aq) + CN^-(aq)
B) HCN(aq) + OH^-(aq) $\leftrightharpoons$ H₂O(l) + CN⁺(aq)
C) CN^- (aq) + H₂O(aq) $\leftrightharpoons$ HCN(aq) + OH^-(aq)
D) HCN(aq) + OH^- (aq) $\leftrightharpoons$ H₂O(l) + CN^-(aq)
E) HCN(aq) + NH₃(aq) $\leftrightharpoons$ NH $_4$ CN(aq)