You are answering a USMLE-style medical question. Question: A 68-year-old man from California presents for a routine checkup. He does not have any complaints. He says that he has tried to keep himself healthy and active by jogging and gardening since his retirement at age 50. He adds that he spends his mornings in the park and his afternoons in his garden. He has no significant medical history. The patient denies any smoking history and drinks alcohol occasionally. On physical examination, the following lesion is seen on his scalp (see image). Which of the following is the most likely diagnosis? Options: A) Psoriasis B) Seborrheic keratosis C) Actinic keratosis D) Squamous cell carcinoma Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.