Answer:
D. the change from war time to peacetime production.
Explanation:
Blatant hyperinflation erupted in Europe, and the world markets were stunned by the rapid decrease in military demand caused by the end of the war. Throughout North America, the slump directly after World War I was relatively short, lasting just seven months from August 1918 to March 1919. Several indicators of economic growth indicate that the recession was fairly intense.