Which Statement by a Patient Indicates Additional Teaching Is Required

Which statement by a patient indicates additional teaching is required about the medication warfarin?

A) "I will continue my diabetic diet and restrict sugar."
B) "I will increase the intake of green, leafy vegetables for a more healthful diet."
C) "I will restrict the intake of foods high in vitamin C."
D) "I will increase the amount of protein in my diet to protect my kidneys."