A technician prepared a solution by heating 100 mL of water while adding KCl crystals until no more KCl would dissolve. She put a lid on the solution and set it aside on the lab bench. After several hours, she noticed the solution had become cloudy and some solid particles had settled to the bottom of the flask. Which statement best describes what happened to the solution? (AKS 6a, DOK2)

A.
At increased temperatures the solubility of KCl increased and remained too high after cooling.

B.
Water molecules, trapped with the KCl crystals, were released after heating.

C.
As the solution cooled, evaporation of water increased the KCl concentration beyond its solubility.

D.
At lower temperatures the solubility of the KCl decreased and recrystallization occurred.