Which of the following has molecules?

Molecules are defined as groups of atoms bonded together, and they are present in all states of matter: solids, liquids, and gases. In solids, molecules are closely packed together in a fixed arrangement, giving them a definite shape and volume. In liquids, molecules are still close together but have the ability to move around each other, allowing liquids to take the shape of their containers while maintaining a fixed volume. In gases, the molecules are far apart and move freely, filling the entire volume of their container.

Therefore, the correct answer indicates that molecules exist in all three states of matter, affirming that everything—solids, liquids, and gases—consists of molecules. This reflects the fundamental understanding of the molecular nature of matter in physical science.