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

  Options: 
 A. At 25°C, they have more mass.
 B. At 25°C, they are moving faster.
 C. At 25°C, they have less kinetic energy.
 D. At 25°C, they are decreasing in volume.
Answer: B