Number 1 sounds better because I wouldn’t necessary say that your differences are a situation but it is an element.
The obvious choice is b you always have a period after mr. mrs. and dr.
There slaves so they helped the other ones and than the other
I think its number three since the subject is about one book.
<span>William Cuthbert Faulkner was an American writer and Nobel Prize laureate from Oxford, Mississippi. Faulkner wrote novels, short stories, a play, poetry, essays, and screenplays. He is primarily known for his novels and short stories set in the fictional Yoknapatawpha County, based on Lafayette County, Mississippi, where he spent most of his life. Most people enjoy his stories because of his clear and creative writing. </span>