You are presented with the question "What is formed when sediments push down on green plants?" and the following answer choices: 
- water
 - moss
 - tar
 - dirt
 - Urea
 - coal
 - oil
 - grass

Now knowing that oil is formed by layers of sediment pushing down on decomposing algae and algae Algae Green algae are the simplest of green plants, choose the best answer.


 

       oil  