Most Economists View the United States' Experience with Trade as

Most economists view the United States' experience with trade as

A) one from which no firm conclusions about the virtues of free trade can be reached,due to the relatively short history of international trade in the U.S.
B) one from which no firm conclusions about the virtues of free trade can be reached,due to the lack of trade within the U.S.throughout most of the early history of the U.S.
C) an ongoing experiment that confirms the virtues of free trade.
D) an ongoing experiment that calls into serious question the notion that free trade enhances the economic well-being of a nation.