Which right guaranteed by the Second Amendment allows individuals to possess weapons?

The right guaranteed by the Second Amendment that allows individuals to possess weapons is explicitly stated as "the right to bear arms." This phrase has generated significant legal interpretations and discussions regarding individual ownership of firearms for purposes such as self-defense and participation in militias. The Second Amendment, ratified in 1791, highlights the view that a well-regulated militia is necessary for the security of a free state, and thus, it emphasizes the importance of allowing citizens to keep and carry weapons.

The other options listed do not pertain to the possession of weapons at all. Free speech pertains to the First Amendment and protects individuals' rights to express their opinions without government interference. The right to a fair trial involves due process protections under the Sixth Amendment and ensures legal fairness in judicial proceedings. The right to privacy is derived from several amendments in the Bill of Rights but does not relate directly to the issue of weapon possession. Therefore, the correct answer focuses specifically on the Second Amendment and its language regarding the individual's right to bear arms.