A new process enables ordinary table salt to be fortified with iron. This advance could help reduce the high incidence of anemia in the world' s population due to a deficiency of iron in the diet. Salt is used as a preservative for food and a flavor enhancer all over the globe, and people consume salt in quantities that would provide iron in significant amounts. Which one of the following most accurately describes the role played in the argument by the statement that people consume salt in quantities that would provide iron in significant amounts? ['It illustrates a principle that underlies the argument.', 'It is a claim that the argument is directed against.', 'It is the conclusion of the argument.', 'It provides support for the conclusion of the argument.']