[单选题]
Supersaturation occurs in air)mqvy,b7z i :e)qn.e l5ba)o4*so-r tcdrb;z when 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.
