[单选题]
In a cloud formation, waterwth 2vp5bx rhk6dpc+2dd3wd84 r2(fr vapor condenses into water8 ba+ad;8el 0swqt1m1o omd,r droplets which get bigger and bigger until it rains. This will cause the tempera;se0a 8wdd81tr m1ooaq l+m,bture of the air in the clouds to
A. increase.
B. decrease.
C. stay constant.
D. freeze.