Final answer:
The 6th Amendment guarantees the right to a trial by jury in criminal cases, providing various rights to a fair trial, including being tried by an impartial jury. Option C is correct.
Step-by-step explanation:
The amendment that guarantees the right to a trial by jury is the 6th Amendment. It ensures the rights of the accused in criminal trials, including the right to a fair and speedy trial by an impartial jury. Specifically, the 6th Amendment states that in all criminal prosecutions, the accused shall enjoy the right to a speedy and public trial, by an impartial jury of the State and district wherein the crime shall have been committed.
It also includes rights such as being informed of charges, the right to confront witnesses, to obtain witnesses in one's favor, and to have the Assistance of Counsel for defense. Therefore, the correct answer to the multiple-choice question is c) 6th Amendment.