Through which contrast is the importance of a human teacher made clear in the story?

Correct answer: Through the contrast between human teacher and mechanical teacher

The governing literary concept is contrast: a writer places two forms of education side by side so that their differences become clear. In the story, Margie and Tommy study separately with mechanical teachers, while the old book describes children learning together from a human teacher in a school. The human teacher represents interaction, explanation, correction, and shared classroom experience, whereas the mechanical teacher mainly delivers programmed lessons. Thus option A is correct. Options B, C, and D mention pairs that do not explain the educational idea or the story's central comparison. Recognising this contrast helps readers understand why Margie begins to imagine the old school as more enjoyable and socially meaningful.