In vast, open stretches of land, the top soil is often blown away by the wind. Possible solutions to this problem are to construct wind barriers or to plant trees. Which of these statements about the two methods is true? A) Wind barriers can deal with the problem and still conserve the natural ecology of the location. B) Planting trees is more economical as compared to constructing wind barriers. C) Planting more trees is only effective in preventing erosion by water. D) Wind barriers are only effective in heavily wooded regions.