Cars are safer to drive. Farmers grow more plants. The amount of air pollution is reduced. The number of cars around the world increases.
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?

Options:
- 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.