Answer: Juvenile polyp.
The image shows a juvenile polyp, the classic 'cherry tumour'. It is a bright red, glistening, pedunculated sphere found in infants and children, usually in the rectum.
How it presents: painless rectal bleeding, and sometimes a polyp that prolapses through the anus during defecation, which may cause pain.
Why not the others: Peutz-Jeghers polyps are hamartomatous, small-bowel predominant, and come with mucocutaneous pigmentation. Villous adenoma is a large, sessile, frond-like premalignant lesion of older adults. Hyperplastic polyps are tiny, pale mucosal nodules with no malignant potential. Ref: Bailey & Love, Short Practice of Surgery, 27th ed, p. 1327