Concept:Soil erosion control includes farming practices that protect the land, whereas harmful activities accelerate erosion.Explanation:Rotational grazing, strip cultivation, and planting shelter belts are all effective ways to reduce soil erosion in the highlands.Indiscriminate felling of trees removes the protective vegetation cover.This exposes the topsoil to wind and rainwater, making erosion worse instead of preventing it.Therefore, indiscriminate felling of trees is not a solution to the problem.Answer:A. Indiscriminate felling of trees