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Strengthen-CE. The correct answer choice is (A)
Because replacing saturated with unsaturated fat decreases the risk of heart disease, people can lower that risk by increasing their intake of unsaturated fat. Since the premise of the argument is about substituting one type of fat for another, the conclusion only follows if increasing the intake of unsaturated fat somehow makes people eat less of the saturated type.
As with all Strengthen questions, begin by looking for the flaw in the argument: does the conclusion follow directly from the premises, and if not, what can you do about it? You cannot strengthen an argument without knowing what is wrong with it first.
Answer choice (A): This is the correct answer choice. It follows directly from our prephrase.
Answer choice (B): This is your typical Shell Game decoy answer: it strengthens a conclusion that is similar to, but sufficiently different from, the one in the stimulus. The author's argument is not about improving overall health: it is only about lowering the risk of heart disease by increasing the intake of unsaturated fats. This answer choice is incorrect.
Answer choice (C): Even if diet is the most important factor, this does not directly support the idea of increasing the intake of unsaturated fat. The relationship of this answer to the conclusion is too remote.
Answer choice (D): This is another Shell Game decoy answer: the author's conclusion is not about increasing life expectancy. Even if lowering the risk of heart disease decreased mortality, we do not need to justify the benefits of doing so. Your goal is only to strengthen the connection between the premises and the conclusion.
Answer choice (E): First, the author is not advocating a diet that includes very little fat. Second, even if she were, this answer would weaken the argument and not strengthen it.