The type of structure is used in the text is chronological because the <span> record of events starting with the earliest and following the order in which they occurred.
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Without food people became malnourished therefore a decrease of population due to famine so no births and productivity since people were too weak to work.
Answer: B- there were many different competing ethnic groups.
Explanation:
The correct answer is letter C. The assassination of Archduke Francis Ferdinand. That is the event that triggered the start of World War I. Archduke Ferdinand was from Austria, the heir to the throne of Austria-Hungary. He was assassinated by Yugoslav nationalist Gavrilo Princip on June 1914.