Which of the following best states the central disagreement between abraham lincoln and stephen douglas on the issue of slavery?

Historians have traditionally regarded the series of seven debates between Stephen A. Douglas and Abraham Lincoln during the 1858 Illinois state election campaign as among the most significant statements in American political history. The issues they discussed were not only of critical importance to the sectional conflict over slavery and states’ rights but also touched deeper questions that would continue to influence political discourse. As Lincoln said, the issues would be discussed long after “these poor tongues of Judge Douglas and myself shall be silent.”

Maybe a horizontal because its a pattern