What is the significance of Dred Scott v. Sanford?

(1 point)
The Supreme Court decision determined that just
because an enslaved person reached a free
state, they were not legally free.
The Supreme Court decision determined that the
southern border of Texas would be at the Rio
Grande.
The Supreme Court decision determined that
Kansas would be a free state.
The Supreme Court decision abolished the
Underground Railroad.

The significance of Dred Scott v. Sanford is that the Supreme Court decision determined that just because an enslaved person reached a free state, they were not legally free.