Final answer:
Foreign Direct Investment (FDI) represents the greatest commitment and involves the greatest risk for a company in a foreign market due to the long-term focus, managerial responsibility, and substantial resource allocation required.
Step-by-step explanation:
The greatest commitment and risk a company can make for a foreign market is engaging in Foreign Direct Investment (FDI). FDI entails purchasing at least ten percent of a firm in another country or starting up a new enterprise overseas. This type of investment requires supplying the investor's domestic currency and demanding the foreign currency, carrying more managerial responsibility, and significantly more planning and resources compared to portfolio investments. It is a strategic move with a long-run focus, exampled by the Belgian company InBev buying the U.S. firm Anheuser-Busch, a transaction that involved supplying euros and demanding U.S. dollars.