The correct answer is: D. Air temperature
As a parcel of air rises, it expands and cools adiabatically. This means that the temperature of the air parcel decreases at a rate of about 10 degrees Celsius per kilometer of ascent. This is because the pressure of the air decreases as it rises, and the air molecules have more space to move around. As they move around more, they collide with each other less often, and the temperature of the air decreases.
Saturation vapor pressure is the maximum amount of water vapor that can be held in the air at a given temperature and pressure. As the air parcel rises, the pressure decreases and the temperature decreases. This causes the saturation vapor pressure to decrease as well.
Relative humidity
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