In the Past Decade,the United States Has Been Running Extraordinary

In the past decade,the United States has been running extraordinary large foreign trade deficits.This is possible by the

A) desire of China,Japan and other countries to keep their currencies from strengthening against the dollar.
B) desire of China,Japan,and other countries to keep their currencies from weakening against the dollar.
C) desire of the U.S.population to save large amounts of their income.
D) desire of the U.S.government to maintain budget surplus.