SI units — practice question

Which pair of units are not equivalent when written in SI base units?

• A$\text{m s}^{-2}$ and $\text{N kg}^{-1}$
• B$\text{N s}$ and $\text{kg m s}^{-1}$
• C$\text{Pa}$ and $\text{N m}^{-2}$
• D$\text{V m}^{-2}$ and $\text{N C}^{-1}$