You are presented with the question "How do you put out a fire?" and the following answer choices: 
- power
 - boiling
 - protect them
 - electrically
 - smother it
 - evaporation
 - mechanical
 - heating liquids

Now knowing that afire requires oxygen to burn and if the oxygen is removed, the fire is smothered, choose the best answer.


 

     smother it    