Concept:Mixed cropping is growing two or more crops together on the same piece of land at the same time (e.g. maize with cowpea).Explanation:Because several crops share the same plot in one season, the land, sunlight and soil nutrients are used more fully and the farmer gets more produce from the same land.Crop rotation and land rotation grow one crop (or leave land fallow) in turn over seasons; mixed farming combines crops and livestock on a farm but does not by itself put more crops on each plot.Answer:Option C (mixed cropping)