Water from a reservoir is delivered to the turbine of a hydroelectric system at a mass flow rate of $500\,\text{kg s}^{-1}$. The reservoir is located $300\,\text{m}$ above the turbine level. The generator driven by the turbine produces an electrical output of $200\,\text{A}$ at a potential difference of $6000\,\text{V}$. Calculate the efficiency of the system.
- A$8.0\,\%$
- B$8.2\,\%$
- C$80\,\%$
- D$82\,\%$