Coordination Compounds

The order of energy absorbed, which is responsible for the colour of the complexes

(A) $[\mathrm{Ni}({\mathrm{H}}_2\mathrm{O}{)}_2(\mathrm{en}{)}_2{]}^{2+}$

(B) $[\mathrm{Ni}({\mathrm{H}}_2\mathrm{O}{)}_4(\mathrm{en}){]}^{2+}$ and

(C) $[\mathrm{Ni}(\mathrm{en}{)}_3{]}^{2+}$

is: