The arrival of the United States ally stopped the advance of the German army in World War I.
What was the cause of World War I?
The calumny of Franz Ferdinand of Austria-Hungary was the contiguous cause of World War I, which took the aforesaid items into play militarism, imperialism, alliances, and nationalism.
The Franz was assassinated by the Black Hand, a Serbian nationalist terrorist organization, in June 1914.
American officers deemed them guilty and sentenced them to death by firing squad, as is customary for spies.
To deter infiltrators, US troops would interrogate suspected Germans to answer trivia questions about America. The entrance of the American ally in World War I halted the German army's march.
Therefore, option B is correct.
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