Why is a human teacher necessary despite the efficiency of the mechanical teacher in the story?

Correct answer: Because education also needs understanding, empathy, and motivation

The mechanical teacher is efficient at routine work, but education has a wider purpose than producing quick answers. Children also need concepts explained in ways they can understand, encouragement when work is difficult, sympathy when they feel discouraged, and motivation to continue learning. A human teacher can respond to the individual child and support personal as well as academic growth. This is why human teaching remains necessary in the story.

Option D is correct because it includes understanding, empathy, and motivation along with instruction. Option A wrongly treats efficiency as a mistake, while option B is contradicted by the machine's ability to teach. Option C is too narrow because children need more than fast results. The story distinguishes mechanical performance from the human development that meaningful education should support.