Critical Reasoning

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 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 usually 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 Yorubam 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 A

Source: GMAT Prep