You are presented with the question "How do cars damage the environment?" and the following answer choices: 
- Battery useage
 - exposure to the sun
 - Emitting an excess of contaminants
 - they travel great distances
 - Using too much gas
 - Causing accidents
 - depress neuronal excitability
 - within and around

Now knowing that using a car causes pollution and pollution is a damaging excess of contaminants, choose the best answer.


 

   Emitting an excess of contaminants      