A rare Roman bronze helmet was recently discovered in England and sold to a private collector. An English law that requires finders of valuable antiquities to offer them to English museums at reasonable prices did not apply to the Roman helmet because it is neither prehistoric nor made of precious of giving the English people access to their archaeological heritage.
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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