The environmental catastrophe of the Great Depression was partly the result of agricultural
mismanagement. Which of the following was the most consequential example of this
mismanagement?
a. Farmers plowed up natural ground cover to grow more crops, cover that had taken
ages to form in the relatively dry sates of the Plains
b. Creating excessive windbreaks which ironically enhanced windstorms
c. Insufficient irrigation
d. Excessive fertilization that poisoned groundwater