A complex involving ${\mathrm{dsp}}^2$ hybridization has

A complex involving ${\mathrm{dsp}}^2$ hybridization has a square planar geometry.

Take a look at the crystal field splitting diagram to see if your metal ion is in group 8 or has a d8 configuration. A four-tiered diagram is seen in square planar complexes (i.e. four different sets of orbitals with different energies). It is tetrahedral if the crystal field splitting diagram contains two tiers.

Hence, option A is correct.