What did technology reduce in education in the story?

Correct answer: Human company and classroom collectiveness

The governing contrast in the story is between individualized mechanical instruction and the shared life of a traditional classroom. Margie and Tommy receive lessons separately at home from mechanical teachers. This arrangement offers convenience, instant evaluation, and lessons adjusted to a child’s level, but it removes daily contact with classmates and a human teacher. Hence option B is correct: technology reduces human company and classroom collectiveness. Option A is a benefit of the machine, not something it removes. Option C is wrong because technology actually enables study at home. Option D is also wrong because adjustment to the learner’s level is presented as one of the machine’s features.