Why Would a Patient Given Only Warfarin (Oral Vitamin K

Why would a patient given only warfarin (oral vitamin K antagonist) therapy initially be at risk for thrombosis rather than bleeding for the first 3 or 4 days of therapy?

A) Factor VIII levels increase initially.
B) Factor VII has a short half-life.
C) Warfarin is absorbed by the intestine only after several days.
D) Protein C and S have short half-lives and decrease sooner than factors II, IX, and X do after beginning therapy.
E) None of the above