A nurse is completing a medical interview with a client who has elevated cholesterol levels and takes warfarin. The nurse should recognize that which of the following actions by the client can potentiate the effects of warfarin?

The client drinks a glass of grapefruit juice every day.

The client sprinkles flax seeds on food 1 hr before taking the anticoagulant.

The client follows a low-fat diet to reduce cholesterol.

The client uses garlic to lower cholesterol levels.