Paragraph: 'Silk production was a closely guarded secret in ancient China. The penalty for revealing it to foreigners was death. For centuries, China monopolized the global silk trade. ___.' Which concluding sentence fits best?
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A
Silk is produced by silkworms feeding on mulberry leaves.
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B
The Silk Road connected China to Europe through Central Asia.
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C
This secrecy allowed China to maintain enormous economic power for generations.
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D
Today, China still produces more silk than any other country.