Which of the following has trigonal bipyramidal structure?

${\mathrm{PCl}}_5\left(g\right)$ has a trigonal bipyramidal structure.

P (Phosphorous) contains 5 valence electrons in orbitals in${\mathrm{PCl}}_5$. It will share one of its electrons from the 3s to the 3d orbitals in order to form five bonds with five Cl atoms, making the hybridization${\mathrm{sp}}^3\mathrm{d}$ Additionally, the geometry will be trigonal bipyramidal with ${\mathrm{sp}}^3\mathrm{d}$ hybridization.

Hence, the option B is correct.