A nurse is reinforcing teaching to the parent of a child who has a prescription for liquid oral iron supplements. Which of the following statements by the parent indicates an understanding of the teaching?

A. "I should give the iron with milk to help prevent stomach upset.": Milk should not be given with iron supplements as it can decrease the absorption of iron. Vitamin C is often recommended with iron to enhance absorption. B. "My child should avoid eating citrus fruits while taking the supplements.": Citrus fruits, which are high in vitamin C, actually help increase the absorption of iron, so they should not be avoided. C. "I should take my child to the emergency room if his stool becomes dark.": Dark stools are a common and harmless side effect of iron supplementation due to unabsorbed iron, so this is not an emergency situation. D. "My child should take the supplement through a straw.": Liquid iron supplements can stain the teeth. To avoid this, it is recommended to give the supplement through a straw to minimize contact with the teeth.