The County Inspector repairing the machine shows not a limit of human teachers but which lack in mechanical teaching?

Correct answer: Even the machine needs human intervention to function

The governing concept is that technology is not completely independent; it depends on human judgment, maintenance, and intervention. In the story, Margie's mechanical teacher develops a problem and the County Inspector has to repair and adjust it. This incident shows that even a device designed to replace a teacher cannot function perfectly without a person who understands the system. Therefore, option A is correct. It also indirectly reminds readers that a human teacher can do more than operate equipment: a teacher can interpret mistakes, respond to feelings, and adapt instruction. Option B is absurd because learners often need help. Option C wrongly assumes that lack of technology makes old schools inferior. Option D reverses the story's meaning, since the machine is not emotional.