Uterine septum (Class V Mullerian anomaly) is the most common uterine anomaly and the leading uterine cause of recurrent miscarriage. Management: Hysteroscopic metroplasty (transcervical hysteroscopic resection) is the procedure of choice. The septum is avascular fibromuscular tissue and is easily incised under hysteroscopic visualization using scissors or resectoscope. This approach requires no abdominal incision, has low morbidity, and significantly improves pregnancy outcomes. Open metroplasty (Strassman, Tompkins, or Jones procedure via laparotomy) is reserved for bicornuate uterus or didelphys, not for a septate uterus. \[\boxed{\text{Hysteroscopic resection of septum (Option B)}}\]