What is the electron configuration of the ${\text{C}}{{\text{r}}^{2 + }}$ ion?

A.     ${\text{[Ar]3}}{{\text{d}}^{\text{5}}}{\text{4}}{{\text{s}}^{\text{1}}}$

B.     ${\text{[Ar]3}}{{\text{d}}^{\text{3}}}{\text{4}}{{\text{s}}^{\text{1}}}$

C.     ${\text{[Ar]3}}{{\text{d}}^{\text{6}}}{\text{4}}{{\text{s}}^{\text{1}}}$

D.     ${\text{[Ar]3}}{{\text{d}}^{\text{4}}}{\text{4}}{{\text{s}}^{\text{0}}}$

D