Final answer:
An assassination, patriotism, and rational thought were factors that led to World War I.
Step-by-step explanation:
The correct options that led to World War I are an assassination, patriotism, and rational thought. The assassination of Archduke Franz Ferdinand was the immediate trigger that set off the chain of events leading to the war. Patriotism played a role as countries sought to defend their national interests and alliances. Rational thought was also a factor as countries weighed their options and made strategic decisions.
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