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Answer (C) is correct . When one currency appreciates, other currencies lose buying power. Thus, if the dollar appreciates against the yen, Japanese customers will find American goods more expensive.

Answer (A) is incorrect because When the earnings of U.S. subsidiaries in Japan are translated into the reporting currency, they will be decreased due to the relative depreciation of the yen.
Answer (B) is incorrect because An appreciation of the dollar would make it cheaper for U.S. firms to buy supplies.
Answer (D) is incorrect because The increased buying power of the dollar would make travel to Japan less expensive.