How did technology change the form of books in the story?

Correct answer: Books became screen-based like telebooks

The governing concept is the transformation of reading media through technology. In the future shown in the story, Margie and Tommy use telebooks, which display text on a screen rather than presenting it on separate printed pages. Their surprise at Tommy's old book proves that screen-based reading has become normal for them, while the printed form has become unfamiliar. Option B is correct because it describes this technological change accurately. Wooden tablets, songs and stone inscriptions are not forms of books presented in the story, so A, C and D are incorrect. The contrast does not mean that reading disappears; instead, the medium changes, and the story invites readers to compare convenience with the physical and shared experience of traditional books.