The correct option is indeed 1, 2, and 3, as all three statements highlight significant advantages of zero tillage in agriculture. Zero tillage allows for sustainable farming practices by enabling crop sowing without prior soil disturbance, thus preserving soil structure and moisture while reducing the need to burn agricultural residues, which presents environmental benefits. Additionally, it facilitates direct seeding methods, such as for rice, which can improve nutrient retention and reduce labor input. Furthermore, zero tillage contributes to carbon sequestration, enhancing soil health and mitigating climate change by trapping carbon dioxide in the soil. This integrated approach aligns with sustainable agricultural principles, essential for contemporary food security and environmental stewardship, as emphasized in UPSC studies.