Cars are safer to drive. Farmers grow more plants. The amount of air pollution is reduced. The number of cars around the world increases.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A scientist discovered a way to turn plant material into fuel. This more cleanly burning fuel can be used in cars. How do people most likely benefit from turning plant material into fuel?
Possibilities:
- Cars are safer to drive.
- Farmers grow more plants.
- The amount of air pollution is reduced.
- The number of cars around the world increases.

The amount of air pollution is reduced.