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Question 68·Medium·Words in Context

Literary scholar Maya Dutta found no document directly recording the day a novelist first arrived in Calcutta. Rather than abandon the inquiry, Dutta combined references in personal letters with dates from shipping manifests and details in weather logs, using materials intended for other purposes to identify the day. Dutta's method exemplifies a ______ approach to research.

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