d
(d) Among the given species. The bond dissociation energy of \(C - O\) bond is minimum in case of \(CO_3^{2 - }\) by which \(C - O\) bond become more weaker in \(CO_3^{2 - }\) or the bond order of \(CO_3^{2 - }\) \((1.33)\) is minimum so the bond become weaker.