In the passage, the author intends to______.A．talk about the positive effects of social ne

In the passage, the author intends to______.

A．talk about the positive effects of social network on teenagers

B．discuss social networks and people"s daily life

C．probe into the meanness in teenagers of social networking sites

D．remind teenagers of the damaging results of online bullying

请帮忙给出正确答案和分析，谢谢！