The correct statement is C. the country could only achieve this through trade.
International trade involves engaging in cross-border business activities.
When a country demands 3,500 computers and 8,000 books but could only produce either 5,000 computers or 20,000 books, the country can satisfy its production capacity and consumption requirements by engaging in trade.
Thus, the correct statement is C. the country could only achieve this through trade.
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