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.


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Bhushan S.
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tough question for me, i thought C first, followed the link for OA and explanationo
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Thanks, Sri
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I choose A.

I think it is OK to assume gambia and senegal are african countries here. The question ask about modern day westernized africans and so A should be talking about those westernized africans who descended from Gambia or senegal.

I go for A because:

The hypothesis is that the high blood pressure likelihood of westernized Blacks compares to that of Whites may reflect an interaction between western high-salt diets and genes that adapted to an environmental scarcity of salt.

A) Blood pressure is low among people whose genes adapt to areas available salt. --> yes, it may support for the hypothesis

B) "serious health problem" doesn't mean this problem relates to blood pressure --> eliminated

C) White Africans have markedly decreased their salt consumption --> this supports for "this likelihood also holds for westernized Black Africans when compared to White Africans" rather than for the hypothesis --> eliminated

D) Blood pressure is low among people far from salt source --> weakens the hypothesis --> eliminated

E) Salt metabolism quite little values to high-salt diets or genes --> eliminated