How is it that crop yields increased in the decades after World War II despite
the number of farms
decreasing?
• A. Cotton began to replace corn as the United States' main
agricultural export.
• B. The growth of bio-engineering produced new types of high-yield
crops.
•
C. Demand for U.S. crops forced more efficient use of
farmland.
existing
D. Mechanization decreased the
land.
number of farmers needed to work