The correct answer is B. Dred Scott
Step-by-step explanation:
Dred Scott was a slaved black man mainly known for having sued his master in the Supreme Court to try to get his freedom in 1857. Scott argued in the court that he had lived in Missouri territory, a territory that was considered as a "free" territory, during four years and because of this, he demanded to be free. However, the Supreme Court did not approve this, because Dred Scott was not protected by law or received any benefits from this as he was a slave and not a citizen of the U.S. Therefore, the slave that sued for his freedom in the Supreme Court was Dred Scott.