A.Wild cereals, grasses, and nuts were exchanged for exotic objects.
B.Social organization in Abu Hureyra decreased as the population grew.
C.Within 2,000 years, populations in southwestern Asia greatly increased in number.
D.Changes in climatic conditions made southwestern Asia highly beneficial to human occupants.
E.The favorable location of Abu Hureyra kept the city from experiencing hardship during drought years.
F.In rich, fertile areas permanent societies evolved to a high level of complexity.