In Passage 2， what kind of people think Internet addiction is not a real problem？

In Passage 2， what kind of people think Internet addiction is not a real problem？
A.Those who have Internet addiction.
B.Those who have a weak personality.
C.Those who can well manage their time spent online.
D.Those who think the Internet is very powerful and useful.
正确答案：Those who can well manage their time spent online.