An electric generator has an electromotive force (e.m.f.) of $200\,\text{V}$ and a current of $3.0\,\text{A}$ in a circuit. An engine with a power of $2.4\,\text{kW}$ drives the generator. What is the efficiency of the generator?
- A$2.8\%$
- B$25\%$
- C$28\%$
- D$36\%$