Which of these indicated that the Tang Dynasty had lost the Mandate of Heaven?

military defeats, rebellions, and economic troubles
earthquakes, economic troubles, and isolationism
rebellions, mass migrations, and military dictators
crop failures, reduced exports, and weakened currency

pleaseee hel

if i am correct the answer is going to be a) the federal program of reconstruction ended.

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.