A hot air balloon pilot wants the balloon to quickly rise several feet higher so it will be above some trees in the distance. Which best explains how the pilot can make the balloon rise?
A. The pilot can adjust the temperature inside the balloon so it is equal to the temperature of the surrounding air.
B. The pilot can adjust the density of the air inside the balloon so it is equal to the density of the surrounding air.
C. The pilot can decrease the temperature inside the balloon so it is cooler than the surrounding air.
D. The pilot can increase the temperature inside the balloon so it is warmer than the surrounding air.
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