Explanation
In this question, as always, we will attempt to find an
answer that must be true. That will
be an objectively correct answer to what is suggested to be true. We can apply
this filter to the answer choices. The answer choices appear to relate to the
author's comments near the end of the passage. We can check back: what is the
point here? It's that some innovations are disproportionately useful, but not
such that the other ones do not have value. Is there any answer choice matching
this view? Answer choice (D) matches the latter part. As the author says,
"Whether that 20%"--the very successful innovations--"could have manifested
itself without a culture and economy to support the whole"--including the other
innovations--"is less clear." So (D) is right on. And if (D) were false, that would undermine the author's
comment. As for the other answer choices, we simply haven't been told
enough--i.e., anything--about where important innovations occur and whether and
how they impact GDP or economic value.
The correct answer is (D).
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