The correct answer is option B. The executive department that deals most with foreign countries is the Department of State. The U.S Department of State is in charge of leading the foreign policy of the country and of advising and aiding the President in all topics related to it. The members and representatives of the Department of State are the ones that negotiate all of the country's international treaties, and also represent the nation abroad and in all the international organizations that the United States is a member of.
