During the Years 1970-1986,the Merchandise Balance of Trade in the U.S.shifted

During the years 1970-1986,the merchandise balance of trade in the U.S.shifted from a

A) trade deficit to a trade surplus.
B) small trade deficit to a large trade surplus.
C) trade surplus to a large trade deficit.
D) small trade surplus to a large trade surplus.
E) large trade surplus to a relatively small trade deficit.