Which of the Following Is True

Which of the following is true?

A) In recent decades, the volume of U.S. international trade has been declining as a share of the economy.
B) Most of the textile products produced in the United States are exported abroad.
C) The volume of U.S. trade with Canada is larger than for any other country.
D) If one party to an international exchange gains, the other party must lose a similar amount.