The answer is First.
The Eighth Amendment addresses issues related to excessive bail, excessive fines, and cruel and unusual punishments. It does not pertain to freedoms of speech, press, petition, assembly, or religion.
The Fifth Amendment provides protections related to due process, double jeopardy, self-incrimination, and eminent domain. It does not guarantee freedoms of speech, press, petition, assembly, or religion.
The Second Amendment protects the right to keep and bear arms. It does not address freedoms of speech, press, petition, assembly, or religion.
The First Amendment guarantees the freedoms of speech, press, petition, assembly, and the free exercise of religion. It is the cornerstone of American civil liberties and is part of the Bill of Rights.
The Fourth Amendment protects against unreasonable searches and seizures and sets requirements for search warrants based on probable cause. It does not guarantee freedoms of speech, press, petition, assembly, or religion.