Library preservationist: Due to the continual physical deterioration of the medieval manuscripts in our library's col...

Ravi on May 24, 2019

@claire_crites,

Happy to help. Let's take a look at (A) and (C).

This is a must be true question, so we're looking for the answer
choice that's something that has to be true based on the information
in the stimulus.

(A) says, "Some of the medieval manuscripts whose authenticity is
suspect are frequently consulted by researchers."

From the stimulus, we know that 1) most medieval manuscripts of
cultural significance will be restored, 2) some manuscripts with
suspect authenticity will be restored, 3) if a manuscript is restored,
its safety can be ensured, and 4) if a manuscript isn't frequently
consulted, it won't be restored

The second and fourth premises from the stimulus combine to give us
this answer choice. Take the contrapositive of the fourth premise and
connect it to the second premise

manuscripts with suspect authenticity - some - restored - >frequently consulted

This means that some manuscripts with suspect authenticity are
frequently consulted, leading us to (A).

(C) says, "All of the medieval manuscripts whose safety can be ensured
during the restoration process are frequently consulted by
researchers."

The problem with (C) is that the things that it discusses are both on
the necessary side of their conditional statements. If we switched
"all" with "some," then this statement would be o.k. However, we can't
combine the premises from the stimulus to push out (C) as it's written
with "all," so this answer choice doesn't work.

Does this make sense? Let us know if you have any more questions!