Which nursing action is the most important to implement when preparing to give ferrous sulfate (Feosol) to a home health care patient?

A. Mix the drug with a high-protein milkshake: Calcium and proteins in dairy can interfere with the absorption of iron. B. Mix it with coffee or cola: Caffeine and certain compounds in coffee/soda can decrease iron absorption. C. Give it undiluted with a small snack: Liquid iron can stain the teeth; giving it undiluted is not recommended. D. Dilute it and offer through a straw and a few crackers: Liquid iron should be diluted and taken through a straw to prevent staining of the tooth enamel. Crackers help prevent the common side effect of GI upset.