Which Explanation Accounts for the Fact That,on Average,cloudy Nights Are

Which explanation accounts for the fact that,on average,cloudy nights are warmer than clear nights?

A) Clouds reflect light incoming from the moon.
B) H₂O does not absorb infrared energy.
C) Clouds are composed of water vapor and H₂O is a strong greenhouse gas.
D) Clouds have a high concentration of carbon dioxide from fossil fuel combustion.