Homoleptic octahedral complexes of a metal ion $M^{3+}$ with three monodentate ligands $L_1, L_2$ and $L_3$ absorb wavelengths in the region of green,blue and red respectively. The increasing order of the ligand strength is:
- A$L_3 < L_1 < L_2$
- B$L_3 < L_2 < L_1$
- C$L_1 < L_2 < L_3$
- D$L_2 < L_1 < L_3$
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