Which of the following co-ordination compound has three stereoisomers?

• A

  $\left[\mathrm{C}\mathrm{d}\right(\mathrm{g}\mathrm{l}\mathrm{y}\left)\right({\mathrm{H}}_2\mathrm{O}\left)\right(\mathrm{N}{\mathrm{H}}_3){]}^{+}$
• B

  $\left[\mathrm{P}\mathrm{b}\mathrm{B}{\mathrm{r}}_2\right({\mathrm{H}}_2\mathrm{O}{)}_2]$
• C

  $\left[\mathrm{C}\mathrm{r}\right(\mathrm{e}\mathrm{n}{)}_3{]}^{3+}$
• Correct answer
  D

  $\left[\mathrm{C}\mathrm{o}\mathrm{B}\mathrm{r}\right(\mathrm{N}{\mathrm{O}}_2\left)\right(\mathrm{e}\mathrm{n}{)}_2{]}^{+}$

Hence, the correct answer is option: 'D'.