What is this passage mainly concerned with？A．The functions of the Department of Labor in A

What is this passage mainly concerned with？

A．The functions of the Department of Labor in America.

B．A serious problem threatening American economy.

C．The successful attempt of regulating sweatshops in America.

D．The seriousness of the problem of sweatshops in America.

请帮忙给出正确答案和分析，谢谢！

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