Why do slash-and-burn cultivators stop using a plot of land every two to three years?
A. The wild vegetation needs time to reestablish itself before it is burned to clear the land and fertilize the soil.
B. They burn so much wood that the air becomes too polluted to support a healthful existence.
C. Slash-and-burn cultivators use relatively primitive irrigation systems, which have to be repaired every three to four years.
D. Slash-and-burn cultivation is unique to segmentary-lineage organized societies, and crop rotation follows the cycle of interlineage exchange.
E. Slash-and-burn cultivation is associated with big-game hunting, which requires regular movement so as not to deplete the animal population.
Answer: A
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