Which of the following is the strongest base:

In the compounds(2),(3) and (4), the lone pair of electrons on nitrogen atom is in resonance with aromatic ring and is not available for donation to an acid. Hence, these compounds are weak bases.In the compound (1), due to presence of methylene group between amino group and benzene ring, the resonance between the lone pair of electrons on N and the benzene ring is not possible. Hence, this lone pair can be readily donated and hence, benzyl amine is strongest base among the given bases.