Which Patient Statement Indicates the Need for Additional Teaching for the Patient

Which patient statement indicates the need for additional teaching for the patient being discharged after total knee placement (TKR) ?

A) "Narcotics may cause constipation, so I will increase my water intake."
B) "I will use an electric razor while I am on the blood thinners after surgery."
C) "I will report pain, tenderness, or warmth in my calf to my doctor immediately."
D) "I need to increase my intake of green, leafy vegetables to aid healing."