Which of the Following Is Correct

Multiple Choice

Which of the following is correct?
i.U.S.total surplus decreases when the United States exports a good.
ii.U.S.total surplus decreases when the United States imports a good.
iii.U.S.total surplus increases when the United States imports a good and when it exports a good.

A) i only
B) iii only
C) i and ii
D) ii only
E) None of the above because the U.S. total surplus does not change as a result of trade