Concept:The kinetic molecular model describes gas particles as tiny, widely separated, and constantly moving.
Explanation:In a gas, the actual volume of the molecules is negligible compared with the empty space between them.
The molecules move freely and rapidly in straight lines until they collide with one another or with the walls of the container.
Because of this large separation and free motion, a gas will spread out to fill every part of the container available to it.
Among the options, only the description of molecules being very far apart and occupying all available space agrees with the model.
Answer:The correct option is C: the molecules are very far apart and occupy all the spaces made available to them.