<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 59-year-old man presents to his primary care physician complaining of leg pain with exertion for the last 6 months. He has cramping in his calves when walking. He states that the cramping is worse on the right than the left and that the cramping resolves when he stops walking. He has had type 2 diabetes mellitus for 15 years and is not compliant with his medications. He has smoked 2030 cigarettes daily for the past 30 years. On examination, the femoral pulses are diminished on both sides. Which of the following is the most likely cause of this patients condition?? A: Joint degeneration, B: Narrowing of the spinal canal, C: Venous thrombosis, D: Atherosclerosis, E: Segmental arterial occlusions due to non-atherosclerotic vasculitis,  <response>: This is a patient with exertional leg pain and cramping that resolves with rest, suggesting intermittent claudication. The history of longstanding diabetes mellitus, smoking, and diminished femoral pulses points towards peripheral arterial disease as the likely cause. The patients symptoms are classic for intermittent claudication caused by atherosclerosis leading to narrowing of the arterial lumen.D: Atherosclerosis 