Which of the following pairs of cations can be separated by adding $N{H}_{4}Cl$  and    $N{H}_{4}OH$ to the mixture?

• A

  $F{e}^{3+},C{r}^{3+}$

• B

  $A{l}^{3+},C{r}^{3+}$

• C

  $F{e}^{3+},A{l}^{3+}$

• D

  $C{r}^{3+},N{i}^{2+}$