Final answer:
Atoms or molecules become more ordered during melting.
Step-by-step explanation:
The correct answer is c. melting. During melting, the atoms or molecules go from a more rigid and ordered arrangement in a solid state to a less ordered and more random arrangement in a liquid state. This change in arrangement results in an increase in disorder.
For example, when ice (solid water) melts into liquid water, the water molecules break their crystal structure and gain more freedom to move around, making the system less ordered.
In contrast, boiling, condensation, and sublimation involve changes from one state to another but do not necessarily result in increased order or a more ordered arrangement of atoms or molecules.
Learn more about Changes of State