单选题Clouds form（）.Aas a mass of warm，humid air rises into the atmosphere and cools，condensing moisture into small dropletsBas winds blow across bodies of water，the sun causes the moisture to be absorbed and move upward forming cloudsCdry air compresses moisture from the atmosphere into cloudsDwhen the relative humidity of the atmosphere is low
单选题
Clouds form（）.
A
as a mass of warm，humid air rises into the atmosphere and cools，condensing moisture into small droplets
B
as winds blow across bodies of water，the sun causes the moisture to be absorbed and move upward forming clouds
C
dry air compresses moisture from the atmosphere into clouds
D
when the relative humidity of the atmosphere is low
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