What is the reason for extreme difference in temperatures at day and night in deserts?

Q. What is the reason for extreme difference in temperatures at day and night in deserts?

A.            Carbon dioxide concentrations are low in desert regions, therefore heat escapes easily

B.            Sand has high heat conduction properties

C.            Lack of moisture leads to escape of heat

D.            None of these

Answer: Lack of moisture leads to escape of heat