Which of the following statements about agricultural fertilizers is false? A. Large amounts of fertilizers are necessary to maintain high crop yields year after year. B. Phosphates are obtained exclusively through mining. C. Nitrate and phosphate runoff cause eutrophication in different communities. D. If the human production of fixed nitrogen stopped, the amount of fixed nitrogen added to the biosphere each year would only be about half of what it is now. E. Global nitrate and phosphate resources are in decline.