Which option best connects geography to the economic activity of the desert and steppe regions? A. Farmers used irrigation to provide water and staged controlled burning of the grasslands to provide fertile soil for farming.

B. Agriculture was difficult because of the poor soils; farmers grew tree crops such as kola and palm trees.

C. These areas did not receive enough water for farming, but nomadic herders could move their herds of goats, sheep, or cattle from place to place in search of water and food.

D. All of the above