You are presented with the question "What happens to the air inside an ocarina when you blow into it?" and the following answer choices: 
- It expands
 - evaporation
 - moves
 - waves
 - Temperature
 - vibrates
 - It decreases
 - friction

Now knowing that blowing air into a whistle causes air to vibrate inside the whistle and an ocarina is a multiple-tone whistle, choose the best answer.


 

      vibrates   