Answer: A. Free trade
Step-by-step explanation:
The question is asking what U.S. economic foreign policy aims to promote.
The United States is a strong believer in the market economy which allows for entrepreneurship and competition. The U.S. tries to spread this to the rest of the world by encouraging free trade as this would encourage competition by producers across different countries.
The U.S. does not always lead the way however with the imposition of tariffs on countries like China. It has been claimed by the government in this case, that this was only done to curb Chinese anti-competitive behavior which would mean that the tariffs are still meant to encourage free trade.