Final answer:
The U.S. Department of Commerce is the agency dedicated to helping U.S. businesses compete internationally, unlike the UNCTAD, WTO, and IMF which serve international interests.
Step-by-step explanation:
The agency dedicated to helping U.S. businesses compete in a global marketplace is B) U.S. Department of Commerce. This national department is specifically tasked with supporting American businesses domestically and internationally, providing necessary resources, tools, and policies to foster an environment conducive to their growth and competitive presence on the global stage. Options such as the United Nations Conference on Trade and Development (UNCTAD), World Trade Organization (WTO), and International Monetary Fund (IMF) serve broader international roles and are not focused solely on the interests of U.S. businesses.
The agency dedicated to helping U.S. business compete in a global marketplace is the U.S. Department of Commerce. It plays a crucial role in promoting American business interests by developing and implementing trade policies, supporting exporting efforts, and encouraging foreign direct investment in the United States.