Answer:
An arrest is found to violate the Fourth Amendment because it was not supported by probable cause or a valid warrant. Any evidence obtained through that unlawful arrest, such as a confession, will be kept out of the case.
Explanation:
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<span>The answer is B. the assassination of Archduke Franz Ferdinand in Sarajevo
Powder keg in general term is a barrel of gunpowder but it is also used figuratively to refer to the way a small event sets off something much larger. Europe already had many small conflicts but in this event Archduke Franz Ferdinand was a heir to the austrian empire so as he was killed by Sarajevo who was Serbian Austria declared war on Serbia. Serbia was an ally of Russia.So Russia declared war on Austria-Hungary, then Triple Alliance and Triple Entente kicked in, bringing the entire continent to war.</span>
