Why can a teacher's being human be considered necessary in the story?

Correct answer: Because human teachers can understand children's feelings and interact with them

The governing idea is that effective teaching requires empathy, communication, and adaptation to a learner's whole personality. In the story, Margie and Tommy receive lessons separately from mechanical teachers, whereas the old schools brought children together with a human teacher. A human teacher could notice confusion, answer questions sensitively, encourage a discouraged child, and build a relationship through conversation. Therefore option A is correct. Option B is false because human teachers can certainly use books. Option C is also false: the mechanical teacher is adjusted to Margie's level, so it does not teach every child at one identical pace. Option D reduces education to play and ignores the real contrast.