What was the effect of technology on Margie's mind during study?

Correct answer: She found studying with the mechanical teacher dull and unpleasant

The governing concept is the psychological effect of machine-based schooling on Margie. Although the mechanical teacher is efficient and can provide lessons at home, Margie does not experience learning as joyful. She dislikes the regular tests, feels bored by the isolated routine, and becomes interested when Tommy describes children studying together in old schools. Therefore, option A correctly describes the technology-induced feeling shown in the story: study with the machine seems dull and unpleasant. Option B reverses her attitude, option C ignores her attraction to shared schooling, and option D is not supported because the machine itself needs adjustment when it gives her geography tests that are too difficult.