You are presented with the question "What would wind going through a whistle cause?" and the following answer choices: 
- vortex
 - friction
 - vibrant colors
 - waves
 - Energy.
 - kinetic energy
 - absence of sound
 - vibrations

Now knowing that blowing air into a whistle causes air to vibrate inside the whistle and soon the wind blows in fresh air, choose the best answer.


 

        vibrations 