Although the first survey produced inconclusive results, a larger follow-up study [Blank 1] the researchers’ original conclusion by finding the same pattern in every region.
Select one answer for each blank.
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Answer: B (confirmed)
The opening word “Although” signals a contrast between the inconclusive first survey and the decisive follow-up study. Because the later study found the same pattern in every region, it supported the researchers’ original conclusion. Thus, “confirmed” is the appropriate completion.