Arrange the following compounds in decreasing order of basicity: C₆H₅NH₂, (C₆H₅)₂NH, (C₆H₅)₃N, NC₆H₁₁NH₂.
a) (C₆H₅)₃N > NC₆H₁₁NH₂ > (C₆H₅)₂NH > C₆H₅NH₂
b) NC₆H₁₁NH₂ > (C₆H₅)₃N > (C₆H₅)₂NH > C₆H₅NH₂
c) C₆H₅NH₂ > (C₆H₅)₂NH > NC₆H₁₁NH₂ > (C₆H₅)₃N
d) (C₆H₅)₂NH > NC₆H₁₁NH₂ > C₆H₅NH₂ > (C₆H₅)₃N
