Which of the Following Statements About Attempts by State and Territorial

Which of the following statements about attempts by state and territorial governments to bar free black migration into their states' borders during the antebellum period is MOST accurate?

A) Because of legal barriers and discrimination,substantial free black communities failed to develop in states and territories beyond the eastern seaboard.
B) In 1857,the U.S.Supreme Court ruled that laws designed to block the immigration of free blacks unconstitutionally deprived black Americans of their rights as federal citizens.
C) Since no free blacks wanted to live in a slave society,only a couple of southern states bothered to pass laws barring in-migration by free blacks.
D) The laws of some northern states automatically assumed that black persons were slaves unless they could provide certification or post a substantial monetary bond to demonstrate otherwise.