Answer:
B. Boiling point
Explanation:
Boiling water: A phase change occurs when water boils.
The three common phases are solid, liquid, and gas. A phase change happens when one phase changes into different phase without a change in chemical composition.
When water boils, the liquid phase becomes a gas (water vapor or steam). The chemical composition of water does not change while boiling because each phase consists of water.
Thus, boiling water is the phenomena of a phase change.
Therefore there will be a phase change at boiling point.
