From the study by the Pew Research Centers Internet & American Life Project, we know t

From the study by the Pew Research Centers Internet & American Life Project, we know that______.

A．something about the Internet lets teenagers suppress their anger

B．social networks are no longer popular among teenagers

C．cruelty and meanness prevail among teenagers on social networking sites

D．few of the teenagers surveyed report positive feelings toward the Internet

请帮忙给出正确答案和分析，谢谢！