Option 1 -> The passage indicates rainwater harvesting is "relatively easy to implement" and integrates well with urban planning, not causing delays.
Option 2 -> Rainwater harvesting is described as "cost-effective" and "reduces dependence on municipal water supplies," not increasing costs.
Option 3 -> The passage states it's an "ancient practice" being integrated into modern planning, complementing rather than disrupting traditional methods.
Option 4 -> The passage explicitly states rainwater harvesting "offers a sustainable solution" and can "secure water for future generations while preserving our environment."
Hence, Option 4: helps in ensuring sustainable water management -> The passage concludes by emphasizing that integrating rainwater harvesting into modern urban planning addresses water scarcity sustainably, plays a crucial role in water management, and helps preserve the environment and ecosystems for future generations -> correct