The correct answer is B) Slaves were property.
The ruling that the Supreme Court made in the Dred Scott decision was "Slaves were property."
Dred Scott v. Sanford Supreme Court Case of 1857 ended up being very controversial. Dred Scott was a black man that lived with his owner in a free state, then it returned to Missouri. Scott claimed that by living in a free state he could emancipate. Then, the Court decided. The decision was that no black people could be considered a citizen of the United States, no matter if they were slaves or free. So Dred Scott could not petition to the court. The controversial decision increased the tensions between the Northern and Southern states.