Which positive side of technology does the mechanical teacher show?

Correct answer: Instant checking and regular lessons

The positive technological feature shown by the mechanical teacher is efficiency and regularity. It gives Margie lessons according to a schedule, presents questions, and checks her answers without requiring a human examiner to be physically present. Option B is therefore correct because it names two actual advantages demonstrated in the story: quick assessment and dependable instruction. Option A belongs to the old human school, which technology does not provide. C is a sensory quality associated with the printed book, not with the machine. D describes a crowded school building and is not an advantage of Margie's system. The story uses these benefits to create a fair comparison: technology can save time and organise instruction, but it cannot automatically supply friendship, emotional understanding, or the shared experience of a classroom.