The correct option is 1, 2, 3, and 4 because all these practices enhance sustainability and resource efficiency in agriculture. Crop diversification (1) mitigates pest outbreaks and soil depletion, while legume intensification (2) enhances soil fertility through nitrogen fixation. The use of tensiometers (3) aids in efficient water management by ensuring optimal irrigation, thus conserving water resources. Vertical farming (4) maximizes space utilization and minimizes land use, reducing the carbon footprint. Together, these practices promote eco-friendly agriculture by fostering biodiversity, improving soil health, and optimizing resource utilization, which align with sustainable development goals.