An Energy Level Scheme for the Orbitals of Second Row $\sigma$

Multiple Choice

An energy level scheme for the orbitals of second row diatomic molecules O₂ through Ne₂, lists the molecular orbitals in the following order of increasing energy $\sigma$ _2s < $\sigma$ *_2s < $\sigma$ _2p(z) < $\pi$ _2p(y) , $\pi$ _2p(x) < $\pi$ *_2p(y) , $\pi$ *_2p(x) < $\sigma$ *_2p(z)
Based on this energy level scheme, the bond order for the bond in the O₂⁺ ion in its ground state is

A) 1.0
B) 1.5
C) 2.0
D) 2.5
E) 3.0