You are presented with the question "What does blowing into a whistle do?" and the following answer choices: 
- makes a sight
 - makes sound
 - causes disruption
 - duplicate itself
 - unidirectional
 - decrease stamina
 - makes hearing
 - to move people

Now knowing that blowing air into a whistle causes air to vibrate inside the whistle and sounds are caused by vibrations in the air, choose the best answer.


 

  makes sound       