According to the article, which of the following statement is true
A．The author believes that a company should focus on training workers in the filed of the specific skills necessary to do the next job.
B．It will not cost as much to retrain workers as the expenditure saved during the years when no training has ever been conducted.
C．In the field of traditional industry where few technical breakthroughs arrive, American firms may stay competitive.
D．American corporation hierarchy prevents the workers from being trained basically.