You are answering a USMLE-style medical question. Question: A 55-year-old man comes to the physician because of a 6-week history of tingling pain in the sole of his right foot when he raises it above chest level during exercises. He reports that he started exercising regularly 2 months ago and that his right calf cramps when he uses the incline feature on the treadmill, forcing him to take frequent breaks. The pain completely disappears after resting for a few minutes. He has an 8-year history of type 2 diabetes mellitus. He has smoked two packs of cigarettes daily for 34 years. His only medication is metformin. His pulse is 82/min, and blood pressure is 170/92 mm Hg. Straight leg raise test elicits pallor and tingling pain in the right foot. There is no pain in the back. His muscle strength is normal. Femoral pulses are palpable; right pedal pulses are absent. Which of the following is the most likely diagnosis? Options: A) Femoropopliteal artery stenosis B) Acute thrombosis of right popliteal vein C) Lumbar spinal stenosis D) Aortoiliac artery stenosis " Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.