Correct increasing order for the wavelengths of absorption for the complexes of Co3+ is
1
[Co(NH3)6]3+, [Co(en)3]3+, [Co(H2O)6]3+
2
[Co(en)3]3+, [Co(NH3)6]3+, [Co(H2O)6]3+
3
[Co(H2O)6]3+, [Co(en)3]3+, [Co(NH3)6]3+
4
[Co(H2O)6]3+, [Co(NH3)6]3+, [Co(en)3]3+