From what did teachers in old schools keep children away?

Correct answer: From lonely machine study at home

The governing contrast in the story is between communal old schools and isolated future education. The old schools brought children together under the guidance of human teachers, so they did not have to study alone at home with a mechanical teaching device. Therefore, option C is correct. The wording means that old-school teachers kept children away from lonely, machine-based study, not that they kept them away from learning itself. Option A reverses the meaning because teachers promoted learning; option B is opposite to the shared classroom model; and option D is also opposite because human teachers encouraged direct conversation. This distinction is important for interpreting the chapter’s criticism of excessive technological isolation.