Which is a theme in the story “two friends”?

What’s the difference between extract and abstract as nouns and verbs?

What is the problem with the following sentence: cameron, who has an extreme and unreasonable suspicion of other people and their motives, suffers from paranoia which is a psychological disorder characterized by delusions of persecution or grandeur, was absolutely sure that someone was following him even though he was absolutely alone and hadn't seen a car for miles and miles.

Which is not among the style choices a writer would use, if he or she is trying to establish a formal writing style/