The region's prime farmland soils and globally significant agricultural industry make it an important focus of our work. Active in the Midwest since the early 1980s, AFT: Works hand-in-hand with farmers to help them protect drinking water and reduce soil erosion by adopting conservation practices like cover crops.
D is your answer :) hope this helps.
Industrialisation. Or that's what I think
Clastic sedimentary rocks are made up of pieces (clasts) of pre-existing rocks. Pieces of rock are loosened by weathering, then transported to some basin or depression where sediment is trapped. If the sediment is buried deeply, it becomes compacted and cemented, forming sedimentary rock.