Answer
A. CH3NH₂ is a weak base.
Explanation
The base dissociation constant, Kb or base ionization constant, is an equilibrium constant that refers to the dissociation. If the value of Kb is small, very little, that is much less than 1, the base is dissociated only to a small extent and so is said to be a weak base.
Since the given Kb value ( 4.4 x 10^-4) of CH3NH₂ is less than 1, then CH3NH₂ is a weak base.
The correct answer is A. CH3NH₂ is a weak base.
