A water pumping system has a pump that takes in $2.0\,\text{kW}$ of electrical power while lifting water. Each second, the system raises $16\,\text{kg}$ of water to a vertical height of $7.0\,\text{m}$. What is the efficiency of the pumping system?
- A$1.8\%$
- B$5.6\%$
- C$22\%$
- D$55\%$