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Well... an interesting question.
As for me I was struggling between B and E, but chose E. Here's my thoughts:
Imo A is incorrect.
The blood pressures of those descended from peoples situated throughout their history in Senegal and Gambia, where salt was always available, are low. First of all, I do not like those explicit geografical pointers (Senegal and Gambia). Next, the argument talks about hypothising that Black Americans are coming from regions with scarce salt. But Choice A offers quite oppisite facts. Out of the Scope.
B. The same story. This answer choice suggests "certain areas of Africa" as a reference point. We are analysing the Black Africans in general, "certain areas" are deceptive.
C is tempting, but how can we be sure that it assumes HIGH blood pressure, but not LOW?
D is tempting as well, but it doesn't bear on genes (I treat "genes" as Subject-specific qualifier).
E I took me quite a long time to land with this choice, but look: if we know that both groups of people have similar salt methabolism level, we may conclude that even if there are different levels of salt consumption in both groups, African people organism itself produces sufficient level of salt. That gives us 100% proof that high salt American diets are killing for Black Africans, who thus expose temselves to high levels of salt inputs.
ye, the correct answer is A, but, to me too, at the first instance, it seemed like this particular choice is refuting the hypothesis presented by the author.
But, if you look closer, you 'll figure out the reason behind. As, the cause of BP--that author marks--is interaction between high-salt diet and genes from salt scare places. But for people who are from salt rich places, hypothesis should be wrong and the first choice says in line with the hypothesis.