A:Thirty three per cent of the workers will be out of work.
B:More jobs will be created by the union.
C:More people will be employed than necessary.
D:The unions will try to increase productivity.
答案：C
解析：本段开头告诉读者“…there are more men than are needed…when two unions quarrel over three jobs, the argument is settled by giving each union two”，接下来作者又进一步说明其实质，即它意味着“33 per cent over manning, 33 per cent less productivity than could be obtained”。