What is the purpose of the passage?

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.

Accepted is to fact as unproven is to

Which literally device involves the repetition of vowels sounds across successive or closely placed words