A 55 year old diabetic patient presented with impotence with history of failure to get erection after papaverine intracavernous injection.Colour doppler shows no abnormality of arteries but shows mild venous run-off,Treatment of choice here would be:

• A. Penile prosthetic implants
• B. Intracavernous injection of papaverine
• C. Psychotherapy
• D. Vacuum constriction device