According to the Islam (2000) article "Comparative Advantage and Trade Balance in U.S. Agricultural Products", which of the following is true of the U.S.? O a.U.S. is the largest trading nation in the world Ob.U.S. is the smallest trading nation in the world OCUS. has a persistent trade deficit problem with the rest of the world Od.US. has a persistent trade surplus problem with the rest of the world Oe. Both (a) and (c) are true