Chris pours hot coffee into a thermal cup with a closed lid. He opens the lid the next day and is disappointed to find the coffee at room temperature. What statement best describes this system?
A.) This is an open system because it was able to exchange energy with its surroundings
B.) This is an open system because it was able to exchange matter and energy with its surroundings
C.) This is a closed system because the heat energy changed to another form of energy within the system
D.) This is a closed system because it was able to exchange energy, but not matter, with its surroundings
