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Question 72·Hard·Words in Context

Orders for a retailer's new delivery service exceeded forecasts during its first two weeks, but the launch coincided with a transit strike that temporarily limited access to stores. Analysts did not dispute the order totals or rule out sustained demand; they maintained that data from ordinary weeks were needed to determine whether the service had permanently changed customer habits. The analysts therefore described the conclusion of permanent change as ______.

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