A client, age 59, complains of leg pain brought on by walking several blocks--a symptom that first arose several weeks ago. The client’s history includes diabetes mellitus and a two-pack-a-day cigarette habit for the past 42 years. The physician diagnoses intermittent claudication and prescribes pentoxifylline (Trental), 400 mg three times daily with meals. The nurse should provide which instruction concerning long-term care（）
A. "Practice meticulous foot care. "
B. "Consider cutting down on your smoking. "
C. "Reduce your level of exercise. "
D. "See the physician if complications occur. "