Archaeologist: Our team discovered 5,000-year-old copper tools near a Canadian river, in a spot that offered easy access to the raw materials for birchbark canoes—birch, cedar, and spruce trees. The tools are of a sort used by the region’s Aboriginal people in making birchbark canoes in more people in Canada built birchbark canoes 5,000 years ago.
What this question is testing
Your task
Find the assumption the argument requires in order for its conclusion to hold.
Common trap
Answers that would help the argument but aren't strictly required (sufficient, not necessary).
Winning move
Negate each choice — the right one breaks the argument when negated.
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