Risk factors for coronary heart disease

Steps:

• Identify key risk factors: high-fat diet contributes to artery plaque buildup; smoking damages blood vessels and promotes clotting.
• Match to diseases: coronary heart disease involves blocked arteries leading to heart attacks, worsened by both factors.
• Eliminate unrelated options: anemia from nutrient lack, emphysema mainly from smoking alone, scurvy from vitamin deficiency.
• Confirm: both factors synergistically increase coronary heart disease risk per medical guidelines.

Why B is correct:

• Coronary heart disease results from atherosclerosis, where high-fat diets raise cholesterol and smoking accelerates plaque formation and vessel narrowing.

Why the others are wrong:

• A: Anemia stems from iron or vitamin deficiencies, not fat intake or smoking.
• C: Emphysema destroys lung tissue primarily via smoking, unrelated to high-fat diets.
• D: Scurvy arises from vitamin C deficiency, with no link to fat or smoking.

Final answer: B