According to the passage, Fabian s theory makes use of which of the following principles？
A. Gas emanating from an explosion will be hotter the more distant it is from the origin.
B. The wavelength of radiation emitted by a gas as it cools remains constant.
C. If pressure remains constant, the volume of a gas will decrease as it is cooled.
D. The volume of a gas will increase as the pressure increases.
E. As gas cools, its density decreases.
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