Fact 1: Blowing air into a whistle causes air to vibrate inside the whistle.

Fact 2: If the persist, blow a whistle loudly into the mouthpiece.

Given the two facts above, answer the question "blowing and causing air to vibrate makes what" with the following options: 
- expand
 - evaporate
 - kinetic energy
 - waves
 - Energy.
 - combine
 - loud noise
 - energy


 

       loud noise  