Answer the following question given this paragraph: 

All waves are the way energy travels through matter. Ocean waves are energy traveling through water. They form when wind blows over the surface of the ocean. Wind energy is transferred to the sea surface. Then, the energy is carried through the water by the waves. Figure below shows ocean waves crashing against rocks on a shore. They pound away at the rocks and anything else they strike.


Q: All waves are the way energy travels through what?

 Choices:

- time

- vacuums

- space

- matter

A:
matter
