In which condition can cyclonic rainfall last for a longer period?

Correct answer: In a broad front and slow-moving air system

Answer: A. Cyclonic or frontal rainfall develops when air is forced to rise along a front, commonly where contrasting air masses meet. Rising air cools, reaches saturation, and allows clouds and precipitation to form. If the front is broad and the weather system moves slowly, the same area can remain under uplift and cloud cover for a relatively long time. This prolongs rainfall. A is correct because a wide frontal zone provides an extended lifting region and slow movement keeps it over one place longer. B is wrong because completely dry air lacks the moisture needed for substantial rain. C is wrong because clear skies indicate an absence of significant rain clouds. D is wrong because frost is a surface deposit of ice, not a condition that creates prolonged cyclonic rainfall. Memory cue: “Broad front plus slow movement means longer uplift and longer rain.”