It can be inferred from Paragraphs 4 and 5 that______.A．we can see other people"s life thr

It can be inferred from Paragraphs 4 and 5 that______.

A．we can see other people"s life through windows

B．it"s easy to learn about distant friends over the network

C．writing on paper doesn"t exist any longer

D．opening photo cards gives us the satisfaction of peace

请帮忙给出正确答案和分析，谢谢！