Potential difference and power — practice question

In base units, the SI unit of potential difference (the volt) is written as

• A$\text{kg m}^2\,\text{A}^{-1}\,\text{s}^{-3}$
• B$\text{m}^2\,\text{A}^{-1}\,\text{s}^{-2}$
• C$\text{kg m}^2\,\text{s}^{-2}$
• D$\text{kg m}^2\,\text{A}^{-1}\,\text{s}^{-3}$