When a country engages in free trade, the "winners" _____ compensate the "losers."

Which of the following is a valid reason government cannot or should not compensate the "losers" of free trade?
A . It is diffcult to pinpoint who the losers are and how much each lost.
B . "Winners" are not responsible for the effects of their comparative advantage and shouldn't be forced to compensate the "losers".
C . Free trade is not "fair trade." The government has no obligation to compensate the "losers".
D . Free trade always creates job opportunities in new industries so "losers" can immediately go out and get new jobs.