A. a supreme court.
The supreme court is the highest court there is. The supreme court is made up of 9 judges which decide on the verdict together. If the majority decides on a verdict, then that verdict will be taken.
When you get tried in a court, you can choose to take the case to a higher court after the trial if there's evidence that was ignored, if new evidence comes to light, or in other rare circumstances. The highest you can go is the supreme court, and once you're tried there and the court comes to a decision, you're done and can't be tried again for whatever crime you were accused.
