Printed books becoming rare indicates which cultural change caused by technology?

Correct answer: Knowledge moved from a physical medium to a digital medium

The governing concept is a change in the medium through which culture and knowledge are preserved and shared. In the future described in the story, children commonly use telebooks, while the printed book Tommy finds is treated as an unusual old object. This does not mean that reading has disappeared; rather, reading has shifted from paper to an electronic form. Option C is correct because it identifies the movement from a physical, printed medium to a digital one. Option A is unrelated to the status of books. Option B makes an unsupported claim that children no longer read, and option D concerns buildings rather than cultural communication or technology.