Alternative fuels are at every gas station. Gasoline comes from a limited resource. Alternative fuels cause pollution. Gasoline engines are too expensive to make.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Why are alternative fuels being used in some automobiles?
Possibilities:
- Alternative fuels are at every gas station.
- Gasoline comes from a limited resource.
- Alternative fuels cause pollution.
- Gasoline engines are too expensive to make.

Gasoline comes from a limited resource.