Answer:
B. unpaid WWI debts.
Step-by-step explanation:
It is reasonable to say that the global economic crisis that followed World War I was caused by the debt that had been accumulated during the war. President Hoover argued that the war was the main reason for the Great Depression of the 1930s. This was due to changes in the international political and economic order, such as the human and economic toll that the war took on the powers of Europe, such as Great Britain, France and Germany.