All of John' s friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well. John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect. If the statements in the passage are true, then which one of the following must also be true? ["Some of John's friends are not telling the truth.", "Most of John's friends are not telling the truth.", 'Smokers often lie about how much they smoke.', "All John's friends know the same lifelong heavy smoker."]