—Boys, would you mind not playing basketball here? 

—_____, Mr. Li. [ ]

A. No, thanks

B. Sorry, we won't do it again

C. You are welcome

D. I can't stand it

群体规范的基本作用是对成员具有（）的作用。

A、吸引

B、比较和评价

C、助长

D、凝聚