What does the imbalance between technological pace and the child's understanding show in the story?

Correct answer: Learning needs not only speed but suitable understanding

The governing concept is learner-centred education: an efficient machine is useful only when its pace and method suit the learner. Margie’s geography lessons are delivered by a mechanical teacher, but the machine gives her tests and explanations in a way she cannot comfortably follow. The County Inspector discovers that the geography sector is set too fast and slows it to the level appropriate for her age. This incident shows that technological speed alone cannot guarantee learning; understanding, adjustment and individual support are also necessary. Thus option B is correct. Option A makes an unsupported absolute claim, option C denies the need revealed by Margie’s difficulty, and option D is unrelated to the problem.