What one is true and why?

Answer:
Solids, liquids, and gases are all matter.
Explanation:
Matter can be defined as the physical aspect of the world. Matter is also consisted of atoms, molecules, and elements and takes up space. All solids, gases, and liquids consist of various numbers of atoms and elements and thus will take up space to some extent. Thus, one can deduce that if matter takes up space, it has weight as well.