Passage Summary: A museum only displays 20th-century art, some of which they own and some they borrow. They sell prints of everything they own, plus prints of some other things they don't own.

Reasoning: The museum only shows 20th-century art; these works are either on loan or in the permanent collection; all permanent works have prints in the store; the store also sells prints of some works not in the permanent collection.

Analysis: To find what 'must be true,' we need to combine the provided rules. We know that every work in the permanent collection is a 20th-century work (because the museum *only* displays 20th-century works and the permanent collection is part of those displays). Since the store sells prints of *all* permanent collection works, it follows that the store sells prints of at least some 20th-century works. Be careful not to assume that 'Nighthawks' is a 20th-century work or that it is on display; the stimulus only says it is sold in the store and is not in the permanent collection.