According to paragraph 1, which device may not be used daily by teens?

Thông tin: A survey into the media habits of teenagers in the USA reveals some surprising statistics. The average teenager spends an incredible eleven hours each day on their mobile phones, computers, games consoles or TVs. That’s more hours than they are awake outside school time! How are they able to do this? The answer, of course, is multitasking.

Vậy nội dung không được đề cập đến là đáp án C. e-book readers