Concept:Rainfall formed when two unlike air masses meet is called cyclonic rainfall.Explanation:When a warm air mass meets a cold air mass, the warm, lighter air is forced to rise above the cold, heavier air.As the warm air rises, it cools and condenses to form clouds.This condensation produces rain along the weather front.This rainfall is associated with cyclones and fronts.It is not caused by mountains or local heating.Answer:C. Cyclonic rainfall