Which of the following statements is correct?

A.

Workers employed by General Motors are approximately twice as productive as their Japanese counterparts.

B.

Between 1979 and1998, Chrysler and Ford eliminated the productivity gap between all of their production facilities and their Japanese counterparts.

C.

Auto workers in the United States are less productive than their Japanese counterparts primarily due to the higher wages U.S. workers receive.

D.

The increase in productivity Japanese manufacturers experienced in the early 1980s was the result primarily of changes in management focusing on inventory systems and plant layout.