What is the main difference between Margie’s machine education and old education?

Margie studied alone with a machine while old children studied together

Margie’s education takes place alone at home with a mechanical teacher that delivers programmed lessons and checks her work. The old system described by Tommy was based on a school building where many children of the same age gathered, learned from a human teacher, and interacted with one another. Thus, option D states the essential contrast: isolated, machine-controlled learning versus shared, social schooling. Option A reverses the facts because Margie has the machine and old children had human teachers. Option B is false because old schools included classmates. Option C is also wrong because printed books, not telebooks, were used in the old system. The comparison highlights the importance of human contact in education.

This is a Class 9 English question. Chapter: The Fun They Had. Topic: impact of technology.