A nurse is instructing a group of clients about nutrition and eating foods high in iron. The nurse should include that which of the following aids in the absorption of iron?

The correct answer is A: Vitamin C. Vitamin C aids in the absorption of non-heme iron, the type of iron found in plant-based foods. It helps convert iron into a form that is more easily absorbed by the body. Vitamin A (choice C) doesn't directly affect iron absorption. Fiber (choice B) and oxalates (choice D) can actually inhibit iron absorption by binding to iron and limiting its uptake. Therefore, Vitamin C is the best choice for aiding in the absorption of iron among the options provided.