Task: Question Understanding
Input (English): 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? (A) The water became a gas. (B) The mass of water increased. (C) The water took a definite shape. (D) The flavor of the water changed.?
Output (English): property, water, changed, water, froze?