Arrange the members of each group in order of decreasing basicity:
(a) Ammonia, aniline, methylamine
(b) Acetanilide, aniline, N-methylaniline
(c) 2,4-Dichloroaniline, 2,4-dimethylaniline, 2,4-dinitroaniline
(d) 3,4-Dichloroaniline, 4-chloro-2-nitroaniline, 4-chloro-3-nitroaniline
(e) Dimethylamine, diphenylamine, N-methylaniline