While Studying the Yanomamö, Napoleon Chagnon Found That Soil Depletion

While studying the Yanomamö, Napoleon Chagnon found that soil depletion was not the only reason these peoples moved their garden plots. His research found that:

A) Major population movements of the Yanomamö were due to warfare and conflict with neighbors.
B) The Yanomamö simply got tired of living in the same area and just packed up and left on a whim.
C) The Yanomamö had developed a 25-year plan that detailed their moves from year to year.
D) After about two to three years, poisonous snakes and alligators started to congregate in the garden plots because the vegetables attracted animals that snakes and alligators liked to eat.
E) These cleared plots eventually became shallow ponds that could not be used as gardens.