The species in which the central atom uses sp2 - hybrid orbitals in its bonding is
CH3+
C is central atom
ep = V+L+A−C2 = 4+3−12 = 3
3 ⇒ Trigonal Planar ⇒ sp2 hybridization.
The correct order of hybridization of the central atom in the following species NH3,[PtCl4]2−, PCl5 and BCl3 is