You are presented with the question "What mostly has a negative effect on the environment?" and the following answer choices: 
- pure water
 - deforestation
 - animals
 - cigarettes
 - municipal trash
 - pure oxygen
 - smoking tobacco
 - chlorofluorocarbons

Now knowing that landfills have a negative impact on the environment and most municipal trash is disposed of in such landfills, choose the best answer.


 

     municipal trash    