20 infer would it take more wave energy to deposit sand or the rocks shown on this beach explain

The correct answer to this open question is the following.

It would take more wave energy to deposit sand or the rocks shown on this beach because rocks are heavier. The energy of the waves can move heavy objects such as rocks. And when heavy storms hit the shores, the waves can transport big rocks. Indeed, there's been cases when rocks the size of a house had been carried by the waves. The ocean waves can also move boulders long distances. In many cases, waves can pull rocks into the shores. That powerful they are.

just took the test the answer is b.