The correct answer is B: The foreign station must be in a country with which the U.S. has a third party agreement. According to FCC Part 97.115, when allowing a non-licensed person to speak to a foreign station, the key requirement is that the foreign station must be in a country that has a third party agreement with the United States. This agreement allows non-licensed persons to participate in amateur radio communications. Third party agreements are international arrangements that permit unlicensed persons to participate in amateur radio communications between the agreeing countries. The control operator must still be present and responsible, and must handle station identification. The non-licensed person doesn't need to be a U.S. citizen - the requirement is about the country where the foreign station is located, not the citizenship of the third party.