What Argument Was Made by Critics of the Dred Scott

What argument was made by critics of the Dred Scott decision such as James McCune Smith and John McLean?

A) The Supreme Court could not be considered an impartial judge in this case because most of the justices were southerners.
B) Citizenship implied the right to keep and carry arms.
C) All free persons born on American soil were automatically citizens.
D) The Republican platform of restricting slavery's expansion was unconstitutional.
E) The nation's founders had never intended for black people to have the rights of citizens.