A Significant Reason That Increases in Demand for Agricultural Products

A significant reason that increases in demand for agricultural products have been relatively small is because increases in the

A) population of the United States have been greater than increases in the productivity of agriculture.
B) population of the United States have been greater than decreases in the productivity of agriculture.
C) incomes of U.S. consumers result in more than proportionate increases in their spending on agricultural products.
D) incomes of U.S. consumers result in less than proportionate increases in their spending on agricultural products.