Which of the molecules listed have an ${\mathrm{sp}}^3$ hybridized central atom?

$\text{ (P) }{\mathrm{PCl}}_3$   

$\text{ (Q) }{\mathrm{COCl}}_2$

$\text{ (R) }{\mathrm{SF}}_4$

The correct option is A. 

 P only
The hybridization of P in ${\mathrm{PCl}}_3$ is ${\mathrm{sp}}^3$.
The hybridization of C in ${\mathrm{COCl}}_2$ is ${\mathrm{sp}}^2$.
The hybridization of S in  ${\mathrm{SF}}_4$ is ${\mathrm{sp}}^3\mathrm{d}$.
Here, molecules listed have an ${\mathrm{sp}}^3$ hybridized central atom is ${\mathrm{PCl}}_3$.