The original Hornbostel/Sachs system had 4 categories:
1. Idiophones - Instruments that vibrate themselves such as a xylophone
2. Membranophones - Instruments that have a vibrating membrane such a as a drum.
3. Chordophones - Instruments with vibrating strings
4. Aerophones - Instruments which incorporate vibration of air.
Answer:
Creativity in the pure and undiluted form is the true definition of Music. Music is an important part of our life as it is a way of expressing our feelings as well as emotions. Some people consider music as a way to escape from the pain of life. It gives you relief and allows you to reduce the stress.
A principal of design that i see in the image is unity because the room represents the ocean and there are fish surrounding which brings everything together and balances out the message the author is trying to get across. hope that helps :)
I think it’s A because I remember learning about this but I’m not 100% sure so if it’s wrong sorry