A nurse is reinforcing teaching with a client who has a prescription for ferrous sulfate elixir. Which of the following statements by the client indicates an understanding of the teaching?

A. Taking ferrous sulfate on an empty stomach can increase absorption but often causes nausea and gastrointestinal upset. Clients are usually advised to take it with a small amount of food if stomach upset occurs. B. Drinking more milk does not prevent constipation and can actually decrease the absorption of iron due to calcium content. Adequate fluids and fiber are recommended instead to manage constipation. C. Black stools are a common and expected side effect of ferrous sulfate due to iron content. Reporting them is not necessary unless accompanied by other concerning symptoms like bleeding or abdominal pain. D. Mixing ferrous sulfate elixir with a full glass of water helps dilute the medication, reducing irritation to the gastrointestinal tract. It also ensures proper dosing and facilitates easier swallowing of the liquid medication.