Myrna: People should follow diets in which fat represents no more than 30 percent of total calories, not the 37 percent the average diet in this country contains. Roland: If everyone in the country followed your recommendation during his or her entire life, just 0. 2 percent would lengthen their lives at all, and then only by an average of 3 months. Modifying our diet is not worthwhile. A lifetime of sacrifice spent eating an unappealing low-fat diet is too high a price to pay for the chance of extending that sacrifice for 3 months. Myrna: But for everyone who dies early from a high-fat diet, many more people suffer from serious chronic diseases because they followed such diets. Myrna responds to Roland by ['showing that the factors considered by Roland are not the only ones relevant in evaluating her recommendation', 'demonstrating that the statistics used by Roland to dispute her recommendation are inaccurate', "pointing out that Roland's argument assumes the very proposition it sets out to prove", 'disputing the correctness of the facts cited by Roland and offering facts that she considers correct']