Most farms were once tilled by animals pulling plows. Today, mechanized plows can quickly till large areas of land. How have mechanized plows most likely affected modern agriculture? A. Mechanized plows allow a wider variety of crops to be planted on a farm. B. Mechanized plows help decrease erosion. C. Mechanized plows help improve a farm's soil quality. D. Mechanized plows allow larger areas to be farmed by a single farmer.