Elif: I think the Internet is very useful. We can learn so many things from it.
Deniz: I agree, but it also has some disadvantages. For example, people can spend too much time online and neglect their studies.
Elif: That's true. We need to be careful.
What is Deniz's main concern about the Internet?
A) It is not useful for learning new things.
B) People might waste too much time on it.
C) It is difficult to use.
D) It is very expensive.