Final answer:
Water vapor particles are separated by larger distances than the size of the particles and move freely, which is distinct from the structured and contact-oriented nature of particles in solids and liquids.
Step-by-step explanation:
The phrase that correctly describes the particles that make up water vapor is 'Particles in a gas are separated by distances that are considerably larger than the size of the particles themselves, and they move about freely'. Unlike in solids and liquids, where particles are in close contact, the particles in a gas like water vapor have enough energy to overcome intermolecular forces, allowing them to move about freely and fill the available space. Therefore, water vapor particles do not have a rigid structure or remain in contact with each other as they would in a solid or liquid state.