A 62-year-old male taking warfarin for stroke prevention in atrial fibrillation presents to his primary care physician with an elevated INR of 10.5 without bleeding. He is instructed to hold his warfarin dose and given 2.5 mg of oral vitamin K1. When would the effects of vitamin K on the INR most likely be noted in this patient?
- A. 1 hour.
- B. 6 hours.
- C. 24 hours.
- D. 72 hours.