Plz help again I failed this test the first time

Which three sentences in this excerpt from arthur conan doyle's "the contest" suggest that the author's tone is mocking?

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.

Urban and rural antonyms synonyms neither