Conceptual approach: The idea "feed the soil, not the crop" means organic farming builds long-term soil fertility and biological activity so that the soil itself becomes the nutrient source for the plant, instead of supplying soluble nutrients straight to the crop as synthetic fertilizers do.
Any practice that (i) uses on-farm/organic inputs, (ii) builds fertility through cultural methods such as crop rotation, green manuring and composting, or (iii) sustains natural nutrient cycling qualifies as "feeding the soil".
Simple recycling of farm waste, by itself, does not necessarily build soil biology or structure and is therefore only an indirect, supporting activity rather than a defining one.
On this reasoning, the practices consistent with the soil-feeding philosophy are those described in (A), (B) and (D).