You are presented with the question "Using a bellows can do what to the oxygen near a fire? " and the following answer choices: 
- increase
 - evaporation
 - diminish
 - absorb
 - decrease
 - It expands
 - electrically
 - heat

Now knowing that fanning a fire increases the oxygen near the fire and then nothing was heard but the bellows which fanned the fire of the furnace, choose the best answer.


 

 increase        