For which substance is the oxidation number of vanadium the same as that in the ${\mathrm{VO}}_3^{-}$ ion?

The oxidation number in V and O in ${\mathrm{VO}}_3^{-}$ is +5 and -6. While V and F in ${\mathrm{VF}}_5$ is +5 and -5 respectively.
As a result,${\mathrm{VO}}_3^{-}$ and ${\mathrm{VF}}_5$ has same oxidation state for their elements.
Hence correct option is D.