Final answer:
The Open Door Policy was a diplomatic policy proposed by the United States toward China to promote equal trading rights for all countries.
Step-by-step explanation:
The Open Door Policy was a diplomatic policy proposed by the United States in the late 19th century, specifically toward China. It aimed to promote equal trading rights for all countries and prevent other nations from establishing exclusive trade monopolies in China. The policy recognized China as an open market for international trade.
The correct answer is D) China. The Open Door Policy was not related to Japan, Belgian Congo, or South Africa.
Learn more about The Open Door Policy in relation to international trade with China