I agree with the other comment
When something is hit harder just like when sound is turned up the waves become higher and more frequent like a zig zag more so then wavy.
Its option 3 an object has potential energy
You could be lying completley still on your bed, and all though it seems you are at rest, you are moving along with the earth around the sun and hence are motion. This is why 'being at rest' is more of a relative term. Hope this helps!
