Blowing air into a whistle causes air to vibrate inside the whistle.
Sounds are vibrations in air.
Blowing air into a whistle creates sounds.
What creates sounds?

[a] energy of moving objects
[b] chemical messengers
[c] the body's largest organ
[d] peace
[e] Thinking hard
[f] Blowing a whistle
[g] Electrical energy
[h] death