I think the answer is C). Floor Consideration because the passage something about the floor being open. That's my reasoning. I f it is not the correct answer and you get the correct answer please let me know because i am taking a test with this question it and i don't know the answer. So, thank you and I hope I helped.
Lincoln was very strongly against slavery, and slavery was a favoured view at that time. People in the South were upset about him winning because they liked slavery. However the North wanted to abolish slavery.
The answer is B, the end of reconstruction. :)