Answer:
Answer A)
Circus clouds are the highest of all clouds and made of ice crystal.
Circus clouds have no visible precipitation.
Answer B)
Because when the warm, moist air rises up and gets cool, water vapor condenses on tiny particles to form liquid water or ice crystal and form cloud.
Answer C)
Precipitation is a fall of moisture from the atmosphere in any form. it is an important input to hydrology.
Floods and droughts are directly related to precipitation.