35 years old lady presented with non-healing ulcer on left medial malleolus for 6 months duration. There is pigmentation around the ulcer. Her legs are mildly oedematous since her first pregnancy at age of 20. From 2 years back she is found to have varicose veins. She had previous 2 cellulitis episodes & currently on penicillin prophylaxis. What is the condition which describe best reason for her ulcer? A. Chronic lymphedema B. Malignancy C. Previous DVT D. Recurrent cellulitis E. Superficial venous reflux