Which of the following is a civil liberty protected by the First Amendment?

The First Amendment of the United States Constitution explicitly protects various fundamental civil liberties, among which is the freedom of speech. This right allows individuals to express their thoughts, ideas, and opinions without government interference or censorship. It is a cornerstone of democratic society, fostering open dialogue and debate. The protection of freedom of speech extends to various forms of expression, including spoken words, written communication, and symbolic acts.

In contrast, the right to bear arms is associated with the Second Amendment, while the guarantee of a fair trial and the right to an impartial jury pertain to rights protected under the Sixth Amendment. Thus, freedom of speech stands out as the correct choice, being specifically enshrined in the First Amendment as a vital aspect of civil liberties in the United States.