A crane is used to raise containers from a ship. One container has a mass of $14\,000\text{ kg}$ and is being moved upwards at a speed of $3.2\text{ m s}^{-1}$. The electric motor that provides the power for lifting the container takes a current of $240\text{ A}$ at a potential difference of $2200\text{ V}$. Calculate the efficiency of the system.
- A$8.1\%$
- B$8.5\%$
- C$48\%$
- D$83\%$