Why does Margie's sadness deeply show the absence of a human teacher?

Correct answer: Because she has no teacher who gives emotional support

The governing idea is that education includes an emotional and social relationship, not only the delivery of information. Margie becomes interested in the old schools because children learned together and were taught by a living person. Her mechanical teacher can assign lessons and tests, but it cannot notice loneliness, respond warmly, or share the excitement of learning. Thus option A is correct: Margie lacks a teacher who can provide emotional support and human companionship in learning. Option B is false because she does study subjects. Option C refers to her initial dislike of old printed books, not the deeper reason for her sadness. Option D is also incorrect because distance is not the central issue. Her sadness reveals the emotional limitation of isolated mechanical instruction.