Which benefit of technology is shown in the story?

Correct answer: Quick checking of answers

Technology can make some parts of learning faster and more convenient. In the story, the mechanical teacher gives Margie regular lessons and checks her answers automatically. When she submits her work, the machine can evaluate it without waiting for a human teacher to read it. This shows a practical benefit: routine assessment can be completed quickly and consistently.

Option A is correct because quick checking of answers is directly connected with the mechanical teacher's function. Sending children to a market, erasing paper, and closing schools are not educational benefits shown in the story. The answer does not mean that speed makes technology complete or perfect; it only identifies one useful advantage while the story also draws attention to the loss of human contact.