Fact 1: Gases from burning coal and oil dissolving in water in the atmosphere causes acid rain.

Fact 2: Acid rain is caused by the burning of fuels such as oil and coal.

Given the two facts above, answer the question "acid rain is caused by burning what?" with the following options: 
- lung
 - grass
 - oil
 - Cars
 - Coal
 - peat
 - nitrogen
 - food


 

   oil      