Each of the following is a reason why the U.S. economy continues to engage in greater amounts of international trade except which one?
a. There are larger cargo ships and airplanes.
b. High-technology goods are more valuable per pound and, thus, more likely to be traded.
c. NAFTA imposes requirements for increased trade between countries in North America.
d. There have been improvements in technology that have improved telecommunications between countries.
e. All of the above are reasons for increased trade by the United States.