A solar panel is used to recharge a battery. The electrical power output from the solar panel is $0.80\,\text{W}$. The panel has an efficiency of $20\%$. What is the power input of the sunlight onto the solar panel?
- A$0.16\,\text{W}$
- B$4.0\,\text{W}$
- C$8.0\,\text{W}$
- D$16\,\text{W}$