Which of the following statements is not true about the complex ion ${\left[\mathrm{Pt}{\left(\mathrm{en}\right)}_2{\mathrm{Cl}}_2\right]}^{2+}$ ?

• A

  It has two geometrical isomers: cis and trans.

• B

  Both the cis and trans isomers display optical activity.

• C

  Only the cis isomer displays optical activity.

• D

  Only the cis isomer has non-superimposable mirror image.