Despite the Loss of Manpower to the War, American Farmers

Despite the loss of manpower to the war, American farmers managed to provide abundant food supplies through

A) bringing new farm acreage into production.
B) improved technology and fertilizer along with the use of Mexican laborers.
C) improving the efficiency of agricultural processing plants.
D) using crop rotation techniques along with the soil bank.
E) using their wives and daughters to bring in the crops.