The Patient Receives an Appropriate Dose of Warfarin (Coumadin), but the International

The patient receives an appropriate dose of warfarin (Coumadin) , but the international normalized ratio (INR) is in the high range. The patient denies taking any aspirin products. What is the best assessment question to ask the patient at this time?

A) "Have you been eating much garlic?"
B) "Have you been eating a lot of salads and vegetables?"
C) "Have you been drinking too much milk?"
D) "Are you restricting your fluids too much?"