During the past year, foreign investment in the United States has been increasing. The likely cause for this is:
A. the United States has been running a trade surplus, demonstrating the strength of the economy
B. interest rates in the United States are higher than those available overseas
C. the U.S. economy has been undergoing a broad expansion during the past year
D. the dollar has been strengthening, producing gains for investors in dollars over the past year
Answer: B. Interest rates in the United States are higher than those available overseas