Answer:
B. required the northern states to follow the Fugitive Slave Law.
Step-by-step explanation:
Dred Scott v. Sanford was a landmark decision of the Supreme Court which established that black people were not considered Americans citizens, whether they were free or enslaved. This meant that they could not ask for any of the protections of the law, such as suing in a court of law. This decision came because Dred Scott, an enslaved black man, argued he should have been free after living in a free state. By stating that a slave in a free state was still considered a slave, the law implicitly required northern states to follow the Fugitive Slave Law.