The intermolecular movement is maximum in [[1]].

Intermolecular movement is a measure of how freely molecules can move in a substance. It depends on the strength of the intermolecular forces that hold the molecules together. In general, the weaker the intermolecular forces, the greater the intermolecular movement.

In this context, gases have the highest intermolecular movement among the three states of matter because gas molecules have the weakest force of attraction. Gas molecules are free to move in any direction and spread out easily to occupy the whole volume of the container they are in. This is why gases have high diffusion rates and low density.