In tropical deserts large diurnal ranges of temperature occur because of the

The large diurnal ranges of temperature in tropical deserts occur mainly because of the absence of cloud cover. In tropical deserts, the sky is usually clear, allowing sunlight to penetrate directly to the ground and heat it up during the day. At night, the clear sky also allows the heat to radiate back into space, leading to a rapid drop in temperature. This temperature difference between day and night can be significant, often reaching 20-30°C or more, which is what we refer to as a large diurnal range of temperature. The other options given are not the primary causes of large diurnal temperature ranges in tropical deserts. While scarcity of water and absence of highlands may contribute to temperature variations, they are not the main drivers of diurnal temperature changes. Prevalence of strong winds may cause variations in temperature, but it is not the primary cause of large diurnal ranges. Similarly, the absence of tradition is not a factor that affects temperature in tropical deserts.