Black Americans are, on the whole, about twice as likely as White Americans to develop high blood pressure. This likelihood also holds for westernized Black Africans when compared to White Africans. Researchers have hypothesized that this predisposition in westernized Blacks may reflect an interaction between western high-salt diets and genes that adapted to an environmental scarcity of salt.

Which of the following statements about present-day, westernized Black Africans, if true, would most tend to confirm the researchers' hypothesis?

(A) The blood pressures of those descended from peoples situated throughout their history in Senegal and Gambia, where salt was always available, are low.

(B) The unusually high salt consumption in certain areas of Africa represents a serious health problem.

(C) Because of their blood pressure levels, most White Africans have markedly decreased their salt consumption.

(D) Blood pressures are low among the Yoruba, who, throughout their history, have been situated far inland from sources of sea salt and far south of Saharan salt mines

(E) No significant differences in salt metabolism have been found between those people who have had salt available throughout their history and those who have not.

OA soon after discussions.
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IMO: A
Cause: High salt in diet by people in Africa, America
Result: High Blood Pressure(BP) in those people
Argument says, High BP in people is a natural response to deal with scarcity of salt. Genes adopted themselves to prevent eradication of available salt.


Answer should support that Blood Pressure is caused as stimulus to prevent the existence of salt in that geographical area.

(A) The blood pressures of those descended from peoples situated throughout their history in Senegal and Gambia, where salt was always available, are low. When salt was always available abundantly , BP didn't increase, it means, BP increased in areas only where presence of salt is very low. Correct.

(B) The unusually high salt consumption in certain areas of Africa represents a serious health problem. It doesn't help to support the conclusion.

(C) Because of their blood pressure levels, most White Africans have markedly decreased their salt consumption. This statement doesn't mention any interrelation between Decrease in salt consumption & Availability of salt in that area.

(D) Blood pressures are low among the Yoruba, who, throughout their history, have been situated far inland from sources of sea salt and far south of Saharan salt mines. BP is low throughout the history doesn't help to prove anything.

(E) No significant differences in salt metabolism have been found between those people who have had salt available throughout their history and those who have not. Salt metabolism is out of context.