Step 1: The hysteroscopic image shows a benign, well-circumscribed smooth-muscle tumour projecting into the uterine cavity, the appearance of a leiomyoma (fibroid).
Step 2: Leiomyomas are the most common pelvic tumour in women, arise from myometrial smooth muscle, and a submucous fibroid distorting the cavity readily produces abnormal uterine bleeding, matching this clinical picture.
Step 3: Therefore option A is correct. Adenomyosis is a diffuse myometrial process without a discrete intracavitary mass, an ovarian neoplasm would not be seen inside the uterine cavity on hysteroscopy, and carcinoma would show irregular friable tissue rather than a smooth fibroid.