A Transition Metal Complex Ion with Octahedral Geometry Has a Value

A transition metal complex ion with octahedral geometry has a value of 4.4 $\times$ 10^-19 J for the crystal field splitting, $\lambda$ _o.What is the wavelength for the absorption maximum, $\lambda$ _max for this complex ion?

A) 5.0 $\times$ 10^-15 nm
B) 450 nm
C) 4.5 $\times$ 10^-16 nm
D) 520 mm
E) 640 nm