You are presented with the question "What increases the amount of organic matter in soil?" and the following answer choices: 
- raining
 - shedding
 - mussels
 - raking
 - herbicide
 - fossil fuels
 - green manures
 - composting

Now knowing that decomposition increases amount of organic matter in soil and composting is simply the natural decomposition of organic matter, choose the best answer.


 

        composting 