Telebooks show which long-term effect of technology?

Correct answer: Children's reading habit and knowledge medium changing

The governing concept is that technology can gradually reshape everyday habits and the medium through which knowledge is received. In the story’s future, children use telebooks and study from mechanical teachers, so printed books and traditional classrooms seem unfamiliar to Margie and Tommy. This is a long-term cultural and educational change, not merely a temporary convenience. Option A is correct because telebooks alter reading practices and the form in which information reaches children. Option B is unsupported: the story does not describe larger school buildings. Option C reverses the trend, since human teachers have been replaced by machines, and D is also contrary to the isolated home-schooling arrangement. The example shows technology changing routines as well as expectations.