Whats the finding of the research undertaken at Carnegie Mellon University?A.People spend

What"s the finding of the research undertaken at Carnegie Mellon University？

A．People spend more time on the Interact now.

B．People spend less time with their families and friends now.

C．The Net proves socially healthier than television.

D．Interact use may cause a drop in psychological health.

请帮忙给出正确答案和分析，谢谢！