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　　Members of the San, a hunter-gatherer society, have a diet far richer in fruits and vegetables and lower in salt than is typical in industrialized societies. They also differ from industrialized societies in that they have extremely low rates of high blood pressure and obesity. However, contrary to what some have claimed, if people in industrialized societies adopted the San’s diet, the incidence of high blood pressure and obesity in these societies might not be dramatically reduced, because ____________.

　　17. Which of the following most logically completes the passage?

　　A. psychological stress, which can also cause high blood pressure, occurs in both industrialized and nonindustrialized societies

　　B. the San’s low-salt diet is due, not to preference, but to the limited availability of salt in their region

　　C. a few members of the San have been found to suffer from circulatory system ailments other than high blood pressure

　　D. members of the San are far more physically active than are most members of industrialized societies

　　E. not all individuals with high blood pressure are obese

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