Why is a human teacher important for a child's learning pace in the story?

Because he can change pace and method by observing the child's understanding

The governing concept is differentiated and responsive teaching. Children do not learn at exactly the same speed or in exactly the same way. A human teacher can observe a learner's answers, hesitation, attention, and progress, then slow down, offer another example, ask a guiding question, or provide greater challenge. This flexibility connects instruction with actual understanding. Option D is correct because it includes both observation and adaptation. Option A is too absolute: a good teacher does not always teach everyone faster. B wrongly says that the teacher keeps a fixed pace, and C confuses support with abandoning difficult material. The story's contrast shows why programmed instruction may fail to respond sensitively.

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