PT42, S4, Q 17 - Our museum displays only

[jefyuan]

How can we make the deduction for answer C the part that says "and not on loan from a private collector"? The question just says all permanent collection is in the store and that the store may contain stuff that isn't part of the permanent collection. From this I don't know how we concluded that they can sell stuff that ins't on loan from private collector.

[ManhattanPrepLSAT1]

How about the short answer first! And then we'll tackle the question in general.

The skinny version for why answer choice (C) must be true is that the works on display in the museum and not on loan from a private collector are part of the museum's permanent collection. We know that there are prints available for all works part of the museum's permanent collection. So, answer choice (C) must be true!

Looking at the question more generally...

The question asks us to find what must be true. There are three statements in this stimulus.

1. If a work is on display in the museum, then it must be a 20th century work and will be either part of the museum's permanent collection or will be on loan from a private collector.
2. There are prints of all works in the museum's permanent collection available in the museum store.
3. Some works that are not part of the museum's permanent collection are also available in the museum store.

Let's move through the answer choices, testing along the way to see if it must be true.

(A) is not necessarily true. I'm not familiar with 20th century artwork, so ignore that constraint for now. Suppose Van Gogh is on loan and being displayed but it's not a very famous work by Van Gogh. According to the third statement, the museum store could up their sales by offering prints of some of Van Gogh's more famous works, even though they're not on display.
(B) is not necessarily true. We know what the museum store must offer, but nothing limits the museum store from offering more - say from different artists of various centuries.
(C) must be true for the reason stated above.
(D) is not necessarily true. Hopper's Nighthawks is available in the museum store, but we do not know that it is displayed in the museum. If it were displayed, then we would know that it would be on loan from a private collector.
(E) is not necessarily true. We don't know whether it is displayed or not.

[Gabyn3]

I am still confused why B is not the correct answer. The stimulus clearly states that Our museum displays only twentieth-century works.

Help

[MinahK651]

Hi,
I got C by eliminating other choices that cannot be proven by the stimulus but I have one question about how the answer choice is written.

So when it says " ...every work that is displayed in the museum and not on loan from a private collector."

Does that mean there can be some that are loan from a private collector just not EVERY?

or does that mean there is every work that is displayed in the museum but NONE that are loan from a private collector?