Answer: Iron , riboflavin, niacin and fiber.
Explanation:
In United States the products that cross the states must be enriched with iron, riboflavin, niacin and fiber in order to maintain its nutritious value.
The refining of grans sometimes leads to loss of some useful nutrients which is very essential for the body.
In this case, after refining some of the important nutrients are added in the food to maintain its value. The nutrients like riboflavin, iron and fiber are added into it so that person eating such wheat is healthy.
