Which of the Following Reactions to Climate Change by Both

Multiple Choice

Which of the following reactions to climate change by both pastoral and transhumant nomads placed stress on the governing systems of riverine societies around 2200 BCE?

A) Nomads were unable to provide trade links between urban centers because of prolonged rains and flooding.
B) Nomads descended on river-valley population centers in large numbers to find food and water for their drought-stricken herds.
C) Nomads withdrew from population centers in search of better grazing,leaving cities without supplies of meat.
D) Impoverished nomads,who had lost their herds to drought,developed new types of boats and turned to piracy.