[单选题]
In a cloud formation, water vapohv ygs11f i,/0ggfb8yr h)6lo) bs j 8j)nxlmif qoa6:319bpof condenses into water droplets which get bigger and bigger 8ap6ofl)xlo:ji b1h9j 36qbf som))nuntil it rains. This will cause the temperature of the air in the clouds to
A. increase.
B. decrease.
C. stay constant.
D. freeze.