Concept: Flooding is controlled by proper land-use planning and drainage systems.Explanation:• Construction of boreholes provides water, not flood control.• Planned layout ensures roads, drains, and buildings are properly arranged to allow free flow of rainwater.• Harvesting rainwater reduces runoff but does not best control flooding in communities.• Tarring of roads increases surface runoff and can worsen flooding.• Therefore, the best way to control floods in communities is through planned layout.Answer: B. planned layout