[单选题]
Supersaturation occurs ppf06h:pd 1hgin air wh z+(;xi-z )ysl rfnq)uen the
A. relative humidity is 100% and the temperature increases.
B. relative humidity is less than 100% and the temperature increases.
C. relative humidity is less 100% and the temperature decreases.
D. relative humidity is 100% and the temperature decreases.
