Answer:
D. Shipping low-yield crops great distances
Explanation:
Von Thunen's model was formed before the period of industrialization and is based on the limiting assumptions is that the city is located centrally within an "Isolated State". This city is self sufficient means all agricultural and domestic products are produced by the city itself. There is no external influences and become isolated or separated from the external world. The Isolated State is surrounded by an unoccupied wilderness which has unurbanized land where no human activities are present means natural environment.
