Answer:
A. enslaved people were not citizens.
Step-by-step explanation:
A. The Supreme Court's ruling against Dred Scott stated that enslaved people were not citizens. In the 1857 case of Dred Scott v. Sandford, the Supreme Court ruled that enslaved individuals, and their descendants, were not U.S. citizens and therefore could not bring a lawsuit in federal court. This decision was widely criticized and contributed to tensions over the issue of slavery in the years leading up to the American Civil War.