The correct answer is:
Taney cannot deny Scott citizenship because it is a federal right.
Before the civil war, only white men with property could vote, and only white people could be United States citizens. African Americans that were born in the United States territory are all citizens, by the The 14th Amendment (1868). So a perfect counterclaim to the claim in the excerpt would be the chosen one because his citizenship is a Federal right by The 14th Amendment.