The correct rank of bond order for $$\text{O}_2^+$$, $$\text{O}_2^-$$, CO and $$\text{O}_2^{2-}$$ is

A

3, 1.5, 3, 1

B

2, 5, 1, 1

C

1.5, 2.5, 3, 2

D

2.5, 1.5, 3, 1