Which of these molecules have non-bonding electrons on the central atom?
$\mathrm{I}:{\mathrm{SF}}_4;\mathrm{II}:{\mathrm{ICl}}_3; \mathrm{III}: {\mathrm{SO}}_2$

• A

  II only 

• B

  I and II only

• C

  I and III only

• D

  I,II and III