Explanation
We are asked to make an inference from the passage, and
the correct answer might be general or specific. We'll start with our
understanding of the essentials, and we will look for an answer choice that is
supported by the passage and which, preferably, must be true. What must the author believe? He must believe
(D). This is the point of the passage: the nanoparticles are not just benign
carriers, but can have further effects that were not currently known. Some of
the possible applications include the examples the author gave in the third
paragraph. Meanwhile, choices (A), (B), (C), and (E) all make statements with
some degree of plausibility, but insufficient support in the passage. They can
be sniffed out as incorrect quickly in that they are fairly high in opinion,
whereas the passage is quite low in opinion, and in fact limits itself in
opinion to what is expressed in (D).
The correct answer is (D).
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