The author implies which of the following about the manufacturing facilities built in southern states during the Second world war? A. They tended to be less well-suited to conversion to peacetime purposes than were manufacturing facilities built in northern states. B. They had a greater impact on the wartime economies of Alabama, Arkansas, Mississippi, and Tennessee than on those of other southern states. C. They temporarily allowed the southern states to surpass the northern states in creating manufacturing jobs. D. Few of them continued to serve their original functions during the postwar period. E. Some of them operated at a very low capacity during as well as after the war.