What change came in children's reading habit because of telebooks?

Correct answer: They began reading text displayed on screens

The governing concept is a change in the medium of reading caused by technology. In the story’s future, a telebook displays its words on a screen, so children read electronically instead of turning the pages of an ordinary paper book. Option B is therefore correct. Option C is the opposite of the text: the old printed book found by Tommy is strange because children normally use telebooks. Option A confuses reading with listening and does not describe the function of a telebook. Option D is unrelated to the narrative. The episode shows that technology can make information accessible in a new form, while also making older reading habits unfamiliar to future children.