What is the best tittle for this billeted list?

What was the primary concern for the missouri statehood question

After the supreme court’s ruling on the dred scott case, many people in the north believed that a. slavery might become legal everywhere. b. slavery might be banned everywhere. c. formerly enslaved people would move to the north. d. formerly enslaved people would stay in the south.

What was martin luther king, jr., referencing in the passage that brought him to lead a protest in birmingham?