Which right is ensured by the Sixth Amendment?

The Sixth Amendment to the United States Constitution is primarily concerned with the rights of individuals in criminal prosecutions. It ensures several key protections for defendants, one of which is the right to be informed of the nature and cause of the accusations against them. This right is fundamental to providing a fair trial, as it allows individuals to prepare an adequate defense. Without being informed of the charges, a defendant cannot fully understand the nature of the prosecution or respond appropriately in court.

The other options represent important rights but are not covered by the Sixth Amendment. The right to privacy pertains more to issues addressed by the Fourth Amendment. The right to bear arms is related to the Second Amendment, which concerns individual gun ownership. Lastly, the right to vote is protected primarily under different amendments, such as the Fifteenth, Nineteenth, and Twenty-fourth Amendments, rather than the Sixth. Thus, recognizing that the Sixth Amendment specifically addresses defendants' rights in criminal cases highlights why being informed of the charges is the correct answer.