During which phase change does the arrangement of water molecules become most orderly?

Answer: During the Freezing stage

Explanation:

Solids are more dense than liquids because their molecules are pressed together.

During solid phase change, the arrangement of water molecules become most orderly

Explanation:

Solids have a definite volume and definite shape

The particles present in a solid are very closely packed since the intermolecular forces between them are very strong. The molecules do not move apart.

This strong forces makes the solids to arrange the particles present in them to take up its position in an orderly arrangement in space. Vibrational motion exists among the particles making them not to move from its position.

Thus water molecules have an orderly arrangement in solid Ice rather than in liquid water.

Entropy is the disorderness or randomness of the molecules which are greater in gases > liquid > solid.

Entropy is less in solid due to the strong attractive forces which exist between the particles present in them.