Why does the professor mention the "free-rider" problem？A．To review a concept he explained

Why does the professor mention the "free-rider" problem？

A．To review a concept he explained in class

B．To give the student a plan to solve her problem

C．To clarify the problem the student is facing

D．To explain a benefit of working in groups

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！

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