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Question 115·200 Super-Hard SAT Reading Questions·Craft and Structure

On ceramicist Nia Calder's rounded vessels, images copied from botanical atlases wrap around the clay without being adjusted for its curvature. From any fixed position, part of a leaf remains visible while another part curves out of sight; as a viewer circles the vessel, the hidden and visible portions trade places until the full image can be assembled. The vessel's form thus ______ the viewer's access to the source material, neither offering the whole image at once nor withholding any of it permanently.

Which choice completes the text with the most logical and precise word or phrase?