Why did civilizations first arise along the Fertile Crescent? A. Animals in this area were very fertile.
B. The region had natural stones and metals for making tools.
O C. The fertile soil led to crop production.
D. Ancient people believed women were more fertile there.

john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.

what are the options?