A diet high in saturated fats increases a person' s risk of developing heart disease. Regular consumption of red wine reduces that risk. Per-capita consumption of saturated fats is currently about the same in France as in the United States, but there is less heart disease there than in the United States because consumption of red wine is higher in France. The difference in regular red-wine consumption has been narrowing, but no similar convergence in heart-disease rates has occurred. Which of the following, if true, most helps to account for the lack of convergence noted above? ['Regular consumption of red wine is declining dramatically among young adults in France, and heart disease typically does not manifest itself until middle age.', 'Consumption of saturated fats is related more strongly to the growth of fatty deposits on artery walls, which reduce blood flow to the heart, than it is to heart disease directly.', 'Cigarette smoking, which can also contribute to heart disease, is only slightly more common in France than in the United States.', 'Over the past 30 years, per-capita consumption of saturated fats has remained essentially unchanged in the United States but has increased somewhat in France.']