Final answer:
The Export-Import Bank of the United States (EXIM) is the principal U.S. agency that supports U.S. business abroad, providing financing and insurance to facilitate exports. Option A is correct.
Step-by-step explanation:
The principal U.S. agency that supports U.S. business abroad is the Export-Import Bank of the United States (EXIM). While the International Monetary Fund (IMF) and the World Bank are significant international financial institutions that provide financial support and promote economic development, their focus is not specifically on supporting U.S. businesses abroad. The IMF is known as a lender of last resort for countries with severe financial difficulties, and the World Bank finances development projects worldwide.
In contrast, EXIM directly supports U.S. businesses by facilitating exports through financing and insurance. Another entity, the Overseas Private Investment Corporation (OPIC), also supports U.S. businesses overseas, primarily by offering financing and risk mitigation tools, but EXIM is the principal agency dedicated to U.S. export financing.