Whole wheat bread is more nutritious than white bread, which has a taste that many people prefer. Bread made from whole-grain white wheat flour, newly available, provides nutrition comparable to whole wheat bread but tastes just like white bread. Once consumers try whole-grain white wheat bread, they will prefer eating it to eating white bread. The conclusion of the argument above is properly drawn if which of the following is assumed? ['Some people prefer the taste of whole wheat bread to that of white bread.', 'Consumers will prefer eating foods that are more nutritious to eating foods that are less nutritious when the foods taste the same.', 'Whole-grain white wheat flour costs consumers more than does white flour but less than does whole wheat flour.', 'Whole-grain white wheat flour is not significantly more difficult to produce than is white flour.']