The authors main purpose of mentioning Facebook is to______.A．compare Facebook with face－t

The authors main purpose of mentioning Facebook is to______.

A．compare Facebook with face-to-face communication

B．emphasize the supplementary function of Facebook to daily communication

C．illustrate the importance of Facebook in helping people to relieve loneliness

D．introduce some ways to make friends on Facebook

请帮忙给出正确答案和分析，谢谢！