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Question 150·200 Super-Hard SAT Reading Questions·Craft and Structure

Before a 1912 handbook appeared, researchers at several laboratories had independently begun favoring the same name for a mineral structure. Yet they still published under rival names, and because the laboratories had not coordinated their usage, this shared preference had not become a common standard. The handbook then used the favored name exclusively; within a decade, researchers routinely cited its usage when rejecting the alternatives. The handbook thus drew on an emerging preference but helped _____ terminological agreement.

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