A nurse is reinforcing discharge teaching for a client who will be taking warfarin (Coumadin) at home. Which of the following statements indicates that the client understands the effects of this medication?

A. "It's okay to have a couple of glasses of wine with dinner." Alcohol can potentiate warfarin’s effect and increase bleeding risk (especially binge or regular drinking); clients should discuss safe limits with their provider and generally avoid excess alcohol. B. "I'll take aspirin for my headaches." Aspirin is an antiplatelet that increases bleeding risk when taken with warfarin; clients should avoid NSAIDs/aspirin unless approved by their provider. C. "I'll be sure to eat foods with lots of vitamin K." Foods high in vitamin K (e.g., leafy greens) reduce warfarin effectiveness; patients should maintain a consistent, moderate intake of vitamin K rather than suddenly increasing it. D. "I'll use my electric razor for shaving." Using an electric razor reduces the risk of cuts and bleeding compared with a straight/blade razor — an appropriate safety measure for someone on warfarin.