Why was the interwar period such a difficult time for germany?

Despite the relatively short period of time, the period represented an era of significant changes worldwide. Petroleum-based energy production and associated mechanisation expanded dramatically leading to the Roaring Twenties, a period of economic prosperity and growth for the middle class in North America, Europe, Asia and many other parts of the world. Automobiles, electric lighting, radio broadcasts and more became common among populations in the developed world. The indulgences of the era subsequently were followed by the Great Depression, an unprecedented worldwide economic downturn that severely damaged many of the world's largest economies.

Explanation:

i am sure the answer is d