I think it's the 3rd and 4th option.
The sentence that has the information is the answer. but there are no sentences that we can see
Answer:
Slavery
Explanation:
Many states on the south and north had different views of slavery. They started a war to end the fight which was called the civil war. In the end this helped the movement of freeing the slaves from slavery.
Answer:
"Look at this fossil I bought at the gift shop,"
Explanation:
"It," causes the sentence to become a run-on, and therefore isn't grammatically correct. However, if the sentence said, "Look at this fossil I bought at the gift shop," then it would have no need to be changed, as it is a full sentence in itself with no run-on.