Answer: The correct answer is option D.
Explanation: All these processes are the physical processes which happen during the phase change of matter.
1. Melting: In this process, water changes its state from solid to liquid. In solid, particles were orderly arranged but in liquid, the particles went apart from each other and orderly arrangement is lost.
2. Condensation: In this process, water changes its state from gas to liquid. In gaseous state, the particles were randomly arranged but in liquid, this random arrangement changes to some orderly arrangement.
3. Freezing: In this process, water changes its state from liquid to solid. In liquid state, the particles were less orderly arranged but in solid, this arrangement changes to more orderly arrangement.
4. Boiling: In this process, water changes its state from liquid to gas. In liquid state, the particles were orderly arranged but in gaseous state, this orderly arrangement changes to random arrangement.
Hence, in boiling process, the particles are least orderly arranged (particles have a lot of space between them) and this is the correct option.
