What two conditions are necessary for condensation to occur? A. The temperature must be above the dew point, and the relative humidity must be low.
B. The air must sink adiabatically, and temperature must be below freezing.
C. The air must sink adiabatically in the absence of condensation nuclei.
D. The air must be cooled to saturation, and condensation nuclei must be available.
E. The air must be warmed to the dew point temperature, and it must be supersaturated.