The number of fat grams in a cup of butter is the same as in an equal amount of margarine. Ttherefore, any baked good made with a given amount of butter is no higher in fat than a baked good made with an equal amount of margarine. The reasoning in the argument is flawed because the argument ['fails to realize that butter or margarine might not be the only fat-containing ingredient in a baked good', 'fails to consider that baked goods differ in the amount of protein and carbohydrates they contain', 'mistakenly believes that all baked goods contain the same amount of butter or margarine', 'tries to differentiate between two type of ingredients that are in fact too similar to be distinguishable']