Vaporization and filtration are both physical separation processes that do not alter the identity of a substances.

The statement is true. Both processes are physical separation processes since they do not change the identity of the substances involved. Vaporization is only a phase change so basically the identity of a substance is still the same. Also, filtration only separates a solid from a liquid, there is no formation of new substances therefore only a physical change.

C, small, hard spheres with insignificant volumes