Final answer:
The United Kingdom leads in foreign direct investments in the United States, with companies from the UK having the highest cumulative value of investments in various sectors within the U.S.
Step-by-step explanation:
The question "Companies from _____ lead in foreign investment in the United States" refers to which country's companies are most active in investing within the U.S. The correct answer is D. United Kingdom. Companies from the United Kingdom lead in terms of the cumulative value of foreign direct investments (FDI) in the United States. This is in contrast to other countries listed such as the Kingdom of Saudi Arabia, Russia, China, and Canada which also invest in the U.S. but not to the same extent as the UK does. Investments from the UK can take many forms, including establishing subsidiaries, acquiring U.S. companies, or investing in U.S. real estate and infrastructure projects.