By the late 1920s, which of the following had begun to hurt
farmers in America?
A. The need for food in Europe was decreasing.
B. There was a shortage of food in America.
C. The demand for food in Europe was too high.
D. Europe was buying all the crops from
American farmers.

b.

Explanation:

the great depression after ww1 left farmers broke

i really really really really really really dont know

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.