Four diatomic species are listed below in different sequences. Which of these presents the correct order of their increasing bond order ?

Question

( A ) ${O_2^-}<{NO}<{C_2^{2-}}<{He_2^+}$ <br/> ( B ) ${NO}<{C_2^{2-}}<{O_2^-}<{He_2^+}$ <br/> ( C ) ${C_2^{2-}}<{He_2^+}<{NO}<{O_2^-}$ <br/> ( D ) ${He_2^+}<{O_2^-}<{NO}<{C_2^{2-}}$</span>