What limitation of the mechanical teacher is revealed when its pace does not match Margie’s learning needs?

Correct answer: It may need human adjustment to match a pupil’s learning pace

Option A is correct. In the story, the County Inspector finds that Margie’s geography sector is geared too quickly and adjusts it. This shows that the mechanical teacher can require human intervention to match its settings to a pupil’s needs; it does not mean that the machine is wholly unable to teach.