Telebooks are evidence of which long-term effect of technology?

Correct answer: Change in reading habits and the medium of accessing knowledge

The governing concept is technological change in the medium of learning. A telebook is read electronically rather than as a conventional printed volume, so it represents a long-term shift in how children read and obtain knowledge. The story shows that this change can become so normal that printed books and old schools seem strange to Margie and Tommy. Thus option A is correct. Option B refers to buildings, not reading practice; option C is unsupported because mechanical teaching replaces, rather than increases, human teachers; and option D is too extreme, since the children continue studying through technology. The evidence points to changed habits and media, not the disappearance of education.