Which of the following most logically completes the passage? A. psychological stress, which can also cause high blood pressure, occurs in both industrialized and non-industrialized 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