Explanation
This question refers to a line in the third paragraph,
which gives an example of how a nanoparticle can have an effect beyond that of
being a benign carrier. So, although we may not have a firm grip on every
scientific detail here, we will look for answer choices that are consistent
with that overarching point. Choice (A) is way out of the ballpark. Choices (B)
and (D) are unlikely, since we know the author's view on these effects is
slightly positive. Choice (C) describes an effect that "does not increase
proportionally with a nanoparticle's size." Is this supported by the passage?
In fact, it is required by the passage; the ultimate effect of the
nanoparticles was greatest for mid-sized particles, even though the affinity
was greatest for larger particles. So the effect must have been enhanced by
some effect that was other than affinity and which manifested itself best at
medium sizes, so it was not proportional to the size of the particle.
The correct answer is (C).
If you believe you have found an error in this question or explanation, please contact us and include the question title or URL in your message.