Which collective side of learning became weaker due to technology in the story?

Correct answer: Sitting together and discussing

The story shows that technological learning is conducted privately and individually. Margie takes lessons at home from a mechanical teacher, so she does not sit beside classmates, exchange ideas, ask questions in a group, or share the ordinary experiences of a schoolroom. Therefore, option A is correct: sitting together and discussing becomes weaker. Option B is not a weakened collective activity; it describes the individual arrangement that technology creates. Option C is a technical action performed by the learner, not a collective learning experience. Option D refers to the medium used for reading and does not itself express social cooperation. The contrast with the old schools makes the point clear: technology may offer convenient personalised instruction, but it can reduce peer interaction, shared discovery, friendship, and the sense of belonging produced by a common classroom.