by reducing the amount of pollution by increasing the number of car sales by increasing the amount of carbon dioxide in the air by eliminating the possibility of accidents
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: In what way do transit systems, such as buses, benefit society?
Possibilities:
- by reducing the amount of pollution
- by increasing the number of car sales
- by increasing the amount of carbon dioxide in the air
- by eliminating the possibility of accidents

by reducing the amount of pollution