Question

which of these can result in desertification of rangelands? overgrazing of livestock leading to wind and water erosion careful irrigation practices combined with moving livestock often windbreaks, careful plowing, and few livestock fertilizing pastures and making sure that there are few livestock grazing

Explanation:

Overgrazing removes vegetation. Without plants, soil is exposed. Wind and water then erode the soil. This degrades rangelands, a key step in desertification. Other options (careful irrigation, windbreaks, fertilizing) are management practices that help prevent desertification, not cause it.

Answer:

overgrazing of livestock leading to wind and water erosion