Which one of the following pairs of species have the same bond order?

Bond order can be determined by the number of electrons:${\text{CN}}^{-}$: $6(C)+7(N)+1=14$ electrons. Bond order $=3$.$\text{CO}$: $6(C)+8(O)=14$ electrons. Bond order $=3$.Both are isoelectronic with ${\text{N}}_2$ and have the same bond order.