Why would it be wrong to call technology only bad in the story?

Correct answer: Because it helps with home study and instant checking

The governing idea is balanced evaluation. The story does not present technology as completely useless; it shows that a mechanical teacher can deliver lessons at home, adjust work to a learner's level and check answers quickly. These features make education convenient and individualised, so option B is correct. At the same time, the story also reveals limitations: Margie studies alone and misses the companionship of children in a traditional school. Option A is false because the machine generally works, while option C is false because it cannot create classmates. Option D is also unsupported, since technology represents the future system rather than a return to the old one.