问题：
[不定项选择题] Since the late 1970’s in the face of a severe loss of market share in dozens of industries, manufacturers in the United States have been trying to improve productivity—and therefore enhance their inte
A、encourage innovation
B、keep labor output constant
C、increase their competitive advantage
D、permit business upturns to be more easily predicted
参考答案：
C、increase their competitive advantage
● 参考解析
