hard · LSAT Logical Reasoning
A manuscript belongs to the royal archive if its watermark is Type Q and either its ink predates 1710 or its binding was made in the palace shop. Fragment H has Type Q. Its ink contains compound z, which predates 1710 unless the ink was chemically restored. The binding bears the palace shop's stitch, but that stitch was copied by provincial binders after 1720. Therefore H belongs to the royal archive.
Which one of the following, if assumed, enables the conclusion to be properly drawn?
- Every palace-bound manuscript has a Type Q watermark, and H's binding has not been replaced.
- Compound z was commonly used by scribes working in the palace shop.
- Provincial binders never used compound z, and H's binding has not been replaced.
- H was bound before 1720, and every pre-1720 palace stitch was made in the palace shop.
- H's ink was not chemically restored, and compound z never appears in ink made in or after 1710.
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