The option that is associated with air that has reached 100% relative humidity is the saturated adiabatic rate (SAR). Thus, the correct option for this question is C.
Relative humidity may be defined as a measurement that signifies the level of water vapor present in a mixture of water and air as compared to the maximum possible amount. It is represented as RH.
Relative humidity also determines a ratio of the humidity ratio of a particular water-air mixture compared to the saturation humidity ratio at a given temperature.
Saturated air has reached 100% relative humidity without any differentiation in the process. So, according to the options, saturated adiabatic rate (SAR) is directly associated with the same phenomenon.
Therefore, the correct option for this question is C.
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