Final answer:
The correct answer is option C) ΔH increases, ΔS decreases.
Step-by-step explanation:
During phase changes, the enthalpy change (ΔH) and entropy change (ΔS) can either increase or decrease depending on the specific phase change. For example, when a substance changes from a solid to a liquid or a liquid to a gas, both ΔH and ΔS typically increase. This is because phase changes involve a change in the arrangement and motion of particles, which leads to an increase in both the energy and randomness of the system.
On the other hand, when a substance changes from a gas to a liquid or a liquid to a solid, both ΔH and ΔS typically decrease. This is because particles become more restricted in their motion and have less energy in these phase changes.