After a successful cardioversion, a male client with a new onset of atrial fibrillation receives a prescription for an anticoagulant. What instruction should the practical nurse (PN) reinforce with the client?

A. Eating green leafy vegetables high in vitamin K can interfere with the action of certain anticoagulants; however, it's not the primary instruction given post-cardioversion. B. Using an electric razor helps prevent cuts and bleeding, which can be more significant due to anticoagulant therapy. C. Doubling the dose after a missed dose is incorrect and potentially dangerous. D. Taking the medication before meals might not be the primary concern regarding anticoagulant use.