Which one of the following compounds has the electron pair geometry as the trigonal bipyramidal with three equatorial positions occupied by lone pairs of electrons?

• A

  ${\mathrm{AlCl}}_3$

• B

  ${\mathrm{XeF}}_2$

• C

  $\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_2{\mathrm{Cl}}_2\right]$

• D

  ${\mathrm{CH}}_3-\mathrm{Mg}-\mathrm{Br}$