The first important national labor organization in the United St

The first important national labor organization in the United States, founded in 1869,was the ______.
A、Knights of Labor(KOL)
B、Trades Union Congress(TUC)
C、American Federation of Labor (AFL)
D、Congress of Industrial Organizations(CIO)
【正确答案】：A
【题目解析】：劳动骑士团是美国第一个国家劳动组织，成立于1869。