The Fourth Amendment states that "the right of the people to be secure in their persons, houses, papers, and effects, against unreasonable, shall not be violated, and no Warrants shall issue, but upon."

The Fourth Amendment protects people from unreasonable searches and seizures. It also says that warrants may be issued only upon probable cause, supported by an oath or affirmation and describing what is to be searched or seized. Therefore, the correct choice is probable cause.

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