At the Proximate Level, and in Relation to Health Status

At the proximate level, and in relation to health status, one key difference between the Southern (Mexican) Pima and the Northern (US) Pima is that:

A) the Southern Pima are much more active physically than the Northern Pima.
B) the Southern Pima diet is high in fat and low in fiber when compared to the diet typically eaten by the Northern Pima.
C) the Northern Pima eat less and exercise more.
D) among the Southern Pima, the ratio between the number of calories in (eaten) and the number of calories out (burned) is much farther apart than among the Northern Pima, for whom the ratio is nearly one to one.
E) This is a bogus question; there is no difference!