Answer:
C. A vacuum
Explanation:
Sound waves require a medium to travel through. Such a medium could be solid, a liquid, or a gas. We all know that sound can travel through air, and if you've ever heard a sounds through a wall or underwater you'll have experienced sound travelling through a solid and a liquid. vacum, however, is a lack of any particles, which means the sound waves have no medium to travel through. Therefore, sound waves are not able to travel through a vacuum, as there is nothing to travel through.
