According to paragraph 4, why did the amount of no-till area increase between 1990 and 2000 in the United States A. More land area had become available for farming during this period. B. Fewer crops were needed since no-till farming had increased the soybean, wheat, and corn crop yields. C. Because conventional farming practices were too expensive, farmers decided to use the cheaper no-till conservation plan. D. The government provided financial support to farmers who practiced soil conservation.