Let us analyze the stimulus for the line of reasoning which is presented.
Societies in which value is measured primarily in financial terms (X) --> invariably fragment into isolated social units (Y).
Money is not the main measure of value in nonindustrial societies (not X) --> they must tend in contrast to be socially unified (not Y).
This is a pretty simple flawed reasoning that is commonly encountered on the GMAT. We know for a fact that:
if x --> Y, then we cannot say anything about the situation where X does not occur. We can be sure that (not Y) --> (not X).
Let us analyze the options given by similarly breaking down the argument into cause (X) and effect (Y).
(A) Animals of different genera
(X) cannot interbreed
(not Y). But that does not prove that jackals and wolves cannot interbreed
(maybe Y), for they belong to the same genus
(not X).
Not the same structure as the stimulus. Eliminate.(B) Ecosystems close to the equator
(X) usually have more species
(Y) than those closer to the poles. Thus, the Sahara Desert must contain more species
(Y) than Siberia does, since the latter is farther from the equator
(X).
Not the same structure as the stimulus. Eliminate.(C) Insects
(X) pass through several stages of maturation
(Y): egg, larva, pupa, and adult. Since insect are arthropods, all arthropods
(superset of X) probably undergo similar maturation processes
(Y).
Not the same structure as the stimulus. Eliminate.(D) Poets
(X) frequently convey their thoughts via nonliteral uses of language
(Y) such as metaphors and analogies. But journalists are not poets
(not X), so surely journalists always use language literally
(not Y).
This is exactly the same structure as that presented in the stimulus and hence is the correct answer. (E) Technologically sophisticated machines
(X) often cause us more trouble
(Y) than simpler devices serving the same function. Since computers are more technologically sophisticated
(X) than pencils, they must tend to be more troublesome
(Y).
Not the same structure as the stimulus. Eliminate.Hope this helps.