With which of the given pairs ${\mathrm{CO}}_2$resembles

• A

  ${\mathrm{HgCl}}_2,{\mathrm{C}}_2{\mathrm{H}}_2$

• B

  ${\mathrm{HgCl}}_2,{\mathrm{SnCl}}_4$

• C

  ${\mathrm{C}}_2{\mathrm{H}}_2,{\mathrm{NO}}_2$

• D

  ${\mathrm{N}}_2\mathrm{O}\text{ and }{\mathrm{NO}}_2$