For Margie, how is the greatest effect of the mechanical teacher seen on the learning process?

Correct answer: It turns learning into a controlled and lonely experience

The governing concept is the effect of automated instruction on a learner's experience. Margie's mechanical teacher follows a fixed programme, gives her lessons at home and measures her performance through tests. This arrangement can be efficient and individualized, but it also places her alone before a machine, without classmates or a human teacher who can respond warmly to her feelings. Option B is correct because it combines the two important effects: control through programmed instruction and isolation from a learning community. A is wrong because Margie is bored rather than fully entertained; C and D describe situations that do not occur in the story.