The correct answer is C) 9. The Supreme Court of the United States typically consists of nine justices. This number is not specified in the U.S. Constitution and has varied throughout history. However, since 1869, there have been nine justices on the Supreme Court. Each justice is appointed by the President of the United States and confirmed by the Senate. The nine justices serve as the final arbiters of the law in the United States, hearing cases that have been appealed from lower federal and state courts. The Supreme Court plays a crucial role in interpreting the Constitution and shaping the legal landscape of the country.