Rex makes himself a bowl of cereal. He puts 28 g of cereal in a bowl and then adds 245 g of milk. Before eating the cereal, he remembers that he has not yet finished his homework, and he runs off to his room to complete his work. Fifteen minutes later, Rex comes back to the kitchen to eat his cereal. He notices that the milk has soaked into the cereal grains and made them larger. Which of the following is true about Rex's cereal-milk mixture? A. The mass of the cereal-milk mixture is still 273 g even though the volume of the cereal grains has increased. B. The mass of the cereal-milk mixture is equal to 217 g, which is the difference in mass between the milk and cereal grains. C. The mass of the cereal-milk mixture is now less than 273 g because the cereal grains have decreased in density. D. The mass of the cereal-milk mixture is now greater than 273 g because the cereal grains have increased in size.