Critical Reasoning

People in isolated rain-forest communities tend to live on a largely vegetarian diet, and
they eat little salt. Few of them suffer from high blood pressure, and their blood pressure
does not tend to increase with age, as is common in industrialized countries. Such people
often do develop high blood pressure when they move to cities and adopt high-salt diets.
Though suggestive, these facts do not establish salt as the culprit in high blood pressure,
however, because ________.

A. genetic factors could account for the lack of increase of blood pressure with age
among such people
B. people eating high-salt diets and living from birth in cities in industrialized
societies generally have a tendency to have high blood pressure
C. it is possible to have a low-salt diet while living in a city in an industrialized
country
D. there are changes in other aspects of diet when such people move to the city
E. salt is a necessity for human life, and death can occur when the body loses too
much salt

I chose the correct answer, but later wondered aren't we looking for a assumption here?
because ________

Its between D and E .
I choose D because E does makes neutral statements which if negated dont influence the conclusion

crimson2283 wrote:People in isolated rain-forest communities tend to live on a largely vegetarian diet, and
they eat little salt. Few of them suffer from high blood pressure, and their blood pressure
does not tend to increase with age, as is common in industrialized countries. Such people
often do develop high blood pressure when they move to cities and adopt high-salt diets.
Though suggestive, these facts do not establish salt as the culprit in high blood pressure,
however, because ________.

A. genetic factors could account for the lack of increase of blood pressure with age
among such people
B. people eating high-salt diets and living from birth in cities in industrialized
societies generally have a tendency to have high blood pressure
C. it is possible to have a low-salt diet while living in a city in an industrialized
country
D. there are changes in other aspects of diet when such people move to the city
E. salt is a necessity for human life, and death can occur when the body loses too
much salt

I chose the correct answer, but later wondered aren't we looking for a assumption here?
because ________

I go with option D..!!!

I chose D too but my doubt is since the question ends with because ----, we are looking for an assumption to fill the blank. Can D be an assumption?

crimson2283 wrote:I chose D too but my doubt is since the question ends with because ----, we are looking for an assumption to fill the blank. Can D be an assumption?

I Think so