Which of the Following Statements About Comparative Advantage Is FALSE

Which of the following statements about comparative advantage is FALSE?

A) There is always a trade between two countries that can make both better off.
B) A country's comparative advantage cannot be determined by looking only at its own economy.
C) International trade will benefit an entire economy, but some particular groups of people may be hurt by expanding trade.
D) Expanding international trade hurts a nation's economy if it causes the nation's currency to depreciate.