Answer the following question given this paragraph: 

All musical instruments create sound by causing matter to vibrate. Most musical instruments use resonance to amplify sound waves and make sounds louder. Most musical instruments also have a way of changing the frequency of sound waves, which changes the pitch of the sounds.


Q: Changing the frequency of sound waves, will change the _________ of the sound of a musical instrument?

 Choices:

- velocity

- distance

- direction

- pitch

A:
pitch
