The correct answer is A. absolute temperature.
The speed of sound in a gas is proportional to the square root of its absolute temperature. This is because the speed of sound is determined by the average kinetic energy of the molecules in the gas, and the average kinetic energy is proportional to the absolute temperature.
The other options are incorrect because they do not affect the speed of sound in a gas. The temperature of a gas does affect the speed of sound, but only indirectly, through its effect on the average kinetic energy of the
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