The water became a gas. The mass of water increased. The water took a definite shape. The flavor of the water changed.
I gave my students this multiple choice question: A student poured water into a plastic tray. The student then put the tray into the freezer. What property of the water changed as the water froze?

Only one answer is correct among these 4 choices:
- The water became a gas.
- The mass of water increased.
- The water took a definite shape.
- The flavor of the water changed.

Could you tell me which one is correct?

The water took a definite shape.