Social isolation in machine education is formed most clearly by which situation?

Correct answer: Margie studying alone at home with a machine

The governing concept is social isolation caused by solitary learning. Margie does not travel to a schoolroom or sit beside other children; she studies at home in front of a mechanical teacher. This arrangement may be efficient, but it removes everyday opportunities for conversation, cooperation, friendship, comparison, and shared enjoyment. Option D is correct because it names both the place and the absence of human company that create isolation. Option A merely describes a feature of a telebook. Option B belongs to the repair episode and does not itself create daily isolation. Option C explains where Tommy found the old book, not how Margie experiences education. The story uses Margie’s routine to show that convenient access can still weaken social learning.