Concept:Diurnal temperature range is the difference between the highest and lowest temperatures recorded in one day.
This range is large in regions with clear skies, dry air, and bare ground.
Explanation:Deserts have very little cloud cover and scarce vegetation.
During the day, the bare ground absorbs strong sunshine and heats up quickly, making temperatures very high.
At night, without clouds to trap warmth, heat escapes rapidly into the atmosphere, so temperatures drop sharply.
Thus, the daily difference between maximum and minimum temperature becomes very large.
Other belts such as Mediterranean, Tropical Continental, and Tropical Hinterland usually have higher moisture or cloud cover.
Those conditions reduce the fall in temperature at night and lower the daily range.
Therefore, the desert belt shows the highest diurnal temperature range among the given options.
Answer:A. Desert