Final answer:
The driest desert on Earth receives an average of 1-2 centimeters of rainfall every 5 to 20 years, with the Sahara and central Australia being some of the driest subtropical desert regions.
Step-by-step explanation:
The driest desert on Earth receives an average of 1-2 centimeters of rainfall every 5 to 20 years. The correct answer to the question is option (a) 1-2. This exceptionally low level of precipitation is characteristic of arid regions like those in central Australia and northern Africa, where the lack of atmospheric water leads to extreme aridity. Subtropical deserts, which include locations such as the Sahara, are capable of going long periods without rain, sometimes decades, while in Antarctica, which is also classified as a desert due to low annual precipitation, the amount of snowfall varies from the coast to the interior near the South Pole.