For the cold pack shown below, the temperature on the outside surface has dropped considerably from its initial temperature of 25 °C. Which of the following provides the best explanation for this temperature decrease? A. The cold pack is releasing cold to the surroundings.
B. Ice is beginning to form on the outside of the bag, lowering its temperature.
C. Energy is traveling out of the bag into the surroundings, making the bag colder.
D. The thermometer is measuring the temperature of the surroundings, which is losing energy.