Concept:Surface irrigation uses gravity to spread water over the soil; sprinkler irrigation uses pressure to spray water overhead.Explanation:Natural flooding and check flooding are both common surface irrigation methods.Mole drainage is a subsurface drainage practice, but it is used to remove waterlogging on clay soils after surface irrigation.Sprinkler irrigation delivers water through pipes and sprinklers under pressure, not by gravity flow over the surface.Thus, sprinkler irrigation is not related to surface irrigation.Answer:C. Sprinkler irrigation