Which group of ions and molecules has delocalized electrons in all the species?

A.     ${\text{C}}{{\text{H}}_{\text{3}}}{\text{COC}}{{\text{H}}_{\text{3}}}{\text{, }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}{\text{CO}}{{\text{O}}^ - }$ and ${{\text{O}}_{\text{3}}}$

B.     ${\text{NO}}_{\text{3}}^ - {\text{, NO}}_{\text{2}}^ -$ and ${\text{C}}{{\text{O}}_{\text{2}}}$

C.     ${{\text{C}}_{\text{6}}}{{\text{H}}_{\text{6}}}{\text{, CO}}_{\text{3}}^{{\text{2}} - }$ and graphite

D.     ${{\text{C}}_{\text{6}}}{{\text{H}}_{\text{6}}}{\text{, CO}}_{\text{3}}^{{\text{2}} - }$ and ${{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}$

C