Which of these presents the correct order of increasing bond order?

1. A
   ${\text{O}}_2^{-}<\text{NO}<{\text{C}}_2^{2-}<{\text{He}}_2^{+}$
2. B
   ${\text{He}}_2^{+}<{\text{O}}_2^{-}<\text{NO}<{\text{C}}_2^{2-}$
3. C
   ${\text{C}}_2^{2-}<\text{NO}<{\text{O}}_2^{-}<{\text{He}}_2^{+}$
4. D
   $\text{NO}<{\text{C}}_2^{2-}<{\text{O}}_2^{-}<{\text{He}}_2^{+}$