Each of the following options contains a set of four molecules. Identify the option (s) where all four molecules possesses permanent dipole moment at room temperature. 

• A

  ${\mathrm{NO}}_2,{\mathrm{NH}}_3,{\mathrm{POCl}}_3,{\mathrm{CH}}_3\mathrm{Cl}$

• B

  ${\mathrm{BF}}_3,{\mathrm{O}}_3,{\mathrm{SF}}_6,{\mathrm{XeF}}_6$

• C

  ${\mathrm{BeCl}}_2,{\mathrm{CO}}_2,{\mathrm{BCl}}_3,{\mathrm{CHCl}}_3$

• D

  ${\mathrm{SO}}_2,{\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Cl},{\mathrm{H}}_2\mathrm{Se},{\mathrm{BrF}}_5$