When Giving Discharge Instructions to a Patient with a Laceration

When giving discharge instructions to a patient with a laceration injury to his lower leg, which is the most important one?

A) Recommend isometric exercises to prevent a deep vein thrombosis (DVT) .
B) Recommend cleansing the wound every 4 hours to prevent an infection.
C) Keep the leg elevated at waist level to prevent any edema.
D) Keep the leg completely immobile to prevent extension of the laceration.