In the comparison between the mechanical teacher and the human teacher, what is the real question about?

Whether a machine can replace human relationship in education

The governing concept is the relationship between technology and humanity in education. The story does not simply ask whether a machine can deliver lessons efficiently; it asks whether programmed instruction can replace the understanding, encouragement, flexibility, and companionship supplied by a person. Margie’s isolated lessons and her curiosity about old schools show that education includes a social and emotional dimension. Option C is correct because it expresses this deeper question. Option A concerns physical weight, option B introduces an unsupported economic comparison, and option D is an irrelevant detail. The contrast is therefore ethical and educational, not merely technical or material.

This is a Class 9 English question. Chapter: The Fun They Had. Topic: the importance of human teachers.