Linguist: Regional dialects, many of which eventually become distinct languages, are responses by local populations to their own particular communicative needs. So even when the unification of the world economy forces the adoption of a universal language itself will inevitably develop many regional dialects.
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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