Social isolation in machine education is clearest from which situation?

Correct answer: Margie studying alone at home with a machine

Option A is correct because Margie studies alone in her house with a mechanical teacher instead of joining classmates in a shared classroom. The physical setting directly shows social isolation: learning happens privately, with no friends beside her and no ordinary opportunity for discussion, cooperation, or play during lessons. Option B shows that the machine needs technical repair, not that Margie is socially isolated. Option C describes the format of a telebook, and D concerns Tommy’s discovery of the old printed book; neither situation proves the absence of companionship. The story uses Margie’s solitary study to question the social cost of highly individualized technological education.