Archduke Ferdinand was assassinated along with his wife Sophie, and his death triggered Austria and Hungary to fight. Alliances were made until WWI became known. The Treaty of Versailles ended it nearly five years later. Some people were forced into the militia so a law was created (can't remember which country) while others went willingly.
Pope Gregory VII and Henry IV came into an argument it went through who will control the appoitments of church officals which is called Inrestiture Controversy. the awnser would be c. hope this helps!!
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