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Question 167·200 Super-Hard SAT Reading Questions·Craft and Structure

At an ancient Mesopotamian port, conversion tablets listed equivalences among several cities' units of weight. Although sometimes treated as steps toward a universal measure, the tablets prescribed no preferred unit, and scribes added new local measures to later versions. Their use in commerce therefore _____ the persistence of multiple standards.

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