The answer is B for question #1
Answer:
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The correct answer to go in the blank would be letter choice C) Mixed or the third option because its true.
Austria-Hungary's invasion of Serbia led to the start of World War I. The correct option among all the options given in the question is the third option. The assassination of Franz Ferdinand, who was also the Archduke of Austria-Hungary by Gavrilo Princip acted as the catalyst for the starting of the World war I. Gavrilo Princip was a Serbian national.
