A 69-year-old edentulous, alcohol-dependent man who lives alone is admitted to the hospital for evaluation of a shoulder wound that is not healing well. On physical examination, numerous ecchymoses are noted on the posterior aspect of his calves and thighs. Careful examination of the patient's skin reveals minute hemorrhages around hair follicles and splinter hemorrhages in the nail beds. Laboratory examination is remarkable for a hemoglobin of 10 g/dL; no other hematologic abnormalities are noted. Which of the following is the most appropriate therapy for this disorder?

1. A)Vitamin B12
2. B)Iron
3. C)Vitamin K
4. D)Vitamin CGABARITO
5. E)Factor VIII