If U.S. net exports are positive

If U.S. net exports are positive
A) other countries borrow from the United States to pay for some of the goods they purchase from the United States.
B) other countries make loans to the United States so that the United States can pay for some of the goods it purchases from other countries.
C) the United States sells some of the assets it owns in other countries to pay for some of the goods it sells to other countries.
D) the United States borrows from other countries to pay for some of the goods the United States purchases from them.