For some years health authorities have believed that people with high blood pressure (hypertension) should restrict their salt intake. Recently scientists found in a large, well-designed study that those with chronic hypertension consume less salt than do their counterparts with normal blood pressure.
If it is true that a diet relatively high in salt is causally linked to the onset of hypertension, which of the following, if true, most plausibly accounts for the new findings?
(A) Only a minority of those with hypertension have been properly diagnosed.
(B) Chronic hypertension is not a serious problem in the population studied.
(C) Most people with chronic hypertension have intentionally restricted their salt intake.
(D) Hypertension occurs most frequently in those who have a family history of hypertension.
(E) Excess salt intake is inherently dangerous to health.