How can a human teacher identify a child's difficulty?

Correct answer: By observing face and behaviour

The governing idea is that a human teacher can observe a learner as a complete person, not merely check a machine-generated answer. By noticing the child’s face, body language, hesitation, silence, repeated errors, or unusual behaviour, the teacher can infer that the lesson is difficult and then offer help. This ability is especially important in “The Fun They Had,” where mechanical teaching is impersonal and isolated. Therefore, option A is correct because observing the child’s face and behaviour provides meaningful clues. Option B is unrelated, while throwing a book or removing classmates cannot reveal the child’s actual difficulty.