Mary Sue is making caramel ice cream. In the first part of the process, she combines a cup of sugar and a cup of water in a saucepan. She cooks the mixture over medium heat until the sugar melts and browns to a light amber color. Then she adds the same amount of water to the mixture along with a cup and a half of cream and milk. Which part of the preparation indicated a chemical change? A. adding cream and milk to the mixture B. mixing the sugar with water C. melting the sugar D. sugar changes from white to a light amber color