An important reason for the large daily temperature range over deserts is:
A. There is little water vapor in the air to absorb and re-radiate infrared radiation
B. The light-colored sand radiates heat very rapidly at night
C. Dry air is a very poor heat conductor
D. Free convection cells are unable to form above the hot desert ground
E. The ozone content of desert air is very low

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Answer: Option A

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