Explanation: One of Darius’s great accomplishments was the establishment of the Royal Road trade route, which matches (A). This enabled interactions between many cultures in the empire, so (D) is incorrect. The Persians were pretty tolerant of foreign religions, so eliminate (B). The trade routes did not venture too far into East Asia, so there would have been little influence from China and other countries that far to the east. Get rid of (C). The correct answer is (A).