选择题：Which of the following statements about labor unions can be concluded based on t

题目内容：

Which of the following statements about labor unions can be concluded based on the information in the passage?

A. Labor unions reached their peak of power in the 1986's.

B. It. took labor unions many years to improve conditions for workers.

C. The early labor unions failed .because they were not concerned with the well-being of workers.

D. The early labor unions failed because they could not agree on what they wanted to fight for.

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