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What is the decreasing order of the basicity of 1°, 2° and 3° ethyl amines and ammonia ?

[1994]

(a) NH3>C2H5NH2>(C2H5)2NH>(C2H5)3N

(b) (C2H5)3N>(C2H5)2NH>C2H5NH2>NH3

(c) (C2H5)2NH>C2H5NH2>(C2H5)3N>NH3

(d) (C2H5)2NH>(C2H5)3N>C2H5NH2>NH3