【单选题】Which of the following statements concerning the productivity levels of automakers can be inferred from the passage?
A.
Prior to the 1960's, the productivity levels of the top Japanese automakers were exceeded by those of United States automakers.
B.
The culture of a country has a large effect on the productivity levels of its automakers.
C.
During the late 1970's and early 1980's, productivity levels were comparable in Japan and the United States.
D.
The greater the number of cars that are produced in a single lot, the higher a plant's productivity level.
E.
The amount of capital investment made by automobile manufacturers in their factories determines the level of productivity.