What is the total number of justices on the Supreme Court?

The total number of justices on the Supreme Court is nine. This number has been established since 1869 and remains the standard today. The Supreme Court is the highest judicial body in the United States, and having nine justices allows for a majority ruling while also providing a balanced and diverse set of opinions on cases that are presented before the court. The number of justices can influence the court's decisions and how cases are interpreted, but currently, there are nine justices serving, which includes one Chief Justice and eight Associate Justices.

The other choices reflect numbers that are either outdated or outside the current structure of the U.S. Supreme Court. Seven, eleven, and twelve justices are not present in the current court system, and historically, while there have been discussions and proposals to change the number of justices, they have not resulted in an actual change to the current nine.