Water from a reservoir is supplied to the turbine in a hydroelectric system at a rate of $510\,\text{kg s}^{-1}$. The reservoir lies $280\,\text{m}$ above the turbine level. The generator, which is driven by the turbine, produces an electrical output of current $205\,\text{A}$ at a potential difference of $5800\,\text{V}$. What is the efficiency of the system?
- A$8.3\%$
- B$12\%$
- C$83\%$
- D$85\%$