b. Investment for Susan and U.S. foreign portfolio investment
Step-by-step explanation:
Investment for Susan because it was built and operated by her. It is foreign portfolio investment because FPI is the entry of funds into a country where foreigners deposit money in a country's bank or make purchases in the country's stock and bond markets, sometimes for speculation
It is not Foreign Direct Investment (FDI) because is an investment in the form of a controlling ownership in a business in one country by an entity based in another country. It was not stated in the question that she based in US.