Why does social learning become weak through machine education?

Correct answer: Because the child studies alone at home

The governing concept is that social learning develops through interaction, cooperation, comparison, and communication with other learners. In the story, Margie studies alone at home with a mechanical teacher, so she has no daily classmates with whom she can discuss answers, share difficulties, or enjoy common activities. Therefore, option B is correct. The weakness comes from isolation, not from the absence of lessons. Option A is false because the machine does provide lessons. Option C is false because telebooks and screens contain written material. Option D is also false: the County Inspector repairs the machine and is not Margie's regular teacher. The question highlights the social cost of isolated technological education.