Perfume sprayed from a bottle spreads more easily in a warm room of 25C than in a cool room of 15C. Which of the following correctly compares perfume molecules at 25C to those at 15C?

Available choices:
A). At 25C, they have more mass..
B). At 25C, they are moving faster..
C). At 25C, they have less kinetic energy..
D). At 25C, they are decreasing in volume..
B).