The correct order of increasing basicity among amines is $ aryl\,\,1{}^\circ <1{}^\circ <3{}^\circ <2{}^\circ $ Hence, aniline $ ({{C}_{6}}{{H}_{5}}N{{H}_{2}}) $ base. As in it, resonance is possible, which decrease electron density on N-atom, hence, it does not loose its lone pair of electron easily.