Step 1: "Feed the soil, not the crop" means fertility is built in the soil itself, not supplied directly to the plant.
Step 2: Practices using on-farm inputs, cultural fertility-building methods and natural nutrient cycling all support this soil-centred approach.
Step 3: Plain recycling of waste, without building soil biology, is only a secondary support activity, not a core soil-feeding practice.
Step 4: Correct answer is (A), (B) and (D) only.