Which of the following practices best exemplifies the integration of resource conservation, waste management in construction, and water conservation technologies in sustainable building practices?

The best practice is a design that uses recycled or locally sourced building materials, sets up an on‑site waste sorting system to divert debris from landfills, and incorporates a rainwater harvesting or greywater recycling system. This approach keeps raw materials out of the supply chain, reduces construction waste, and supplies water for irrigation or flushing. By combining these three elements, the building reduces its overall environmental footprint. A small example is a modular office that uses recycled steel, sorts concrete and timber waste on site, and captures roof runoff for toilet use. This integrated strategy is a clear illustration of sustainable building practice.