A 44-year-old woman complains of continuous vaginal bleeding for 6 months. She has had an endometrial biopsy 3 months ago and the histology report revealed proliferative endometrium. She did not respondto medical treatment with norethisterone 5 mg twice daily 21 days. Transvaginal ultrasound scan reveals an endometrial thickness of 9mm. The haemoglobin level is 9 gm/dl. The platelet count is normal. What is the most appropriate method of treatment? A. Insert a levonorgestrel-releasing intrauterine system. B. Perform a dilatation and curettage. C. Perform a hysterectomy. D. Perform endometrial ablation. E. Treat with oral contraceptive pills for 3 cycles.