A Major Reason Why It Is Difficult to Lower the Barriers

A major reason why it is difficult to lower the barriers to free trade is

A) that total benefits are less than total costs from free trade.
B) that the barriers allow us to compete with cheap foreign labour.
C) the loss of jobs without any gain of jobs from free trade.
D) the uneven distribution of gains and losses from free trade.
E) the inability to compensate losers from free trade.