单选题 The passage suggests that which of the following would be LEAST important in determining whether a research subject is likely to contract coronary heart disease?

• (A) The ratio of LDL to HDL in the subject's blood
• (B) The subject's level of blood cholesterol
• (C) The subject's percentage of body fat
• (D) The subject's degree of physical inactivity
• (E) The consumption ratio of polyunsaturated fats to monounsaturated fats