If Clouds Are Composed of Water Droplets, How Do They

If clouds are composed of water droplets, how do they remain suspended in the atmosphere?

A) The cloud droplets are so small that air turbulence keeps them suspended.
B) A constant updraft of warm air is necessary.
C) The pressure of infrared radiation from the surface of the Earth keeps them suspended.
D) Clouds only appear to be suspended; they are actually falling at a rate of 1 m a second.
E) The clouds are magnetically attracted to the ionosphere.