Question ID:PT37 S4 Q5 Passage:After 1950, in response to record growth in worldwide food demand, farmers worldwide sharply increased fertilizer use.  As a result, the productivity of farmland more than doubled by 1985.  Since 1985, farmers have sought to increase farmland productivity even further.  Nevertheless, worldwide fertilizer use has declined by 6 percent between 1985 and the present. Stem:Which one of the following, if true, most helps to resolve the apparent discrepancy in the information above? Correct Answer Choice:DChoice A:Since 1985 the rate at which the world's population has increased has exceeded the rate at which new arable land has been created through irrigation and other methods. Choice B:Several varieties of crop plants that have become popular recently, such as soybeans, are as responsive to fertilizer as are traditional grain crops. Choice C:Between 1950 and 1985 farmers were able to increase the yield of many varieties of crop plants. Choice D:After fertilizer has been added to soil for several years, adding fertilizer to the soil in subsequent years does not significantly improve crop production. Choice E:Between 1975 and 1980 fertilizer prices temporarily increased because of labor disputes in several fertilizer-exporting nations, and these disputes disrupted worldwide fertilizer production.