Which One of These Equations Represents the Reaction of a Weak

Multiple Choice

Which one of these equations represents the reaction of a weak acid with a weak base

A) H⁺(aq) + OH^-(aq) $\rarr$ H₂O(aq)
B) H⁺(aq) + CH₃NH₂(aq) $\rarr$ CH₃NH₃⁺(aq)
C) OH^-(aq) + HCN(aq) $\rarr$ H₂O(aq) + CN^-(aq)
D) HCN(aq) + CH₃NH₂(aq) $\rarr$ CH₃NH₃⁺(aq) + CN^-(aq)