You are answering a USMLE-style medical question. Question: On routine screening, a 62-year-old man is found to have positive fecal occult blood tests. He is asymptomatic, but his father died of large intestinal cancer. Abdominal and rectal exams are normal. A colonoscopy subsequently reveals a polyp in the descending colon but no other abnormalities. Excisional biopsy of the polyp shows 75% tubular architecture. Which of the following is the most likely diagnosis? Options: A) Inflammatory polyp B) Adenomatous polyp C) Hamartomatous polyp D) Colorectal cancer Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.