One theme in this excerpt from Isaac Asimov's "The Fun They Had" is remembering the past. Which sentence in the excerpt best reflects this theme?
Margie went into the schoolroom. It was right next to her bedroom, and the mechanical teacher was on and waiting for her. It was always on at
the same time every day except Saturday and Sunday, because her mother said little girls learned better if they learned at regular hours.
The screen was lit up, and it said: "Today's arithmetic lesson is on the addition of proper fractions. Please insert yesterday's homework in the
proper slot."
Margie did so with a sigh. She was thinking about the old schools they had when her grandfather's grandfather was a little boy. All the kids from
the whole neighborhood came, laughing and shouting in the schoolyard, sitting together in the schoolroom, going home together at the end of
the day. They learned the same things, so they could help one another on the homework and talk about it.
And the teachers were people.
The mechanical teacher was flashing on the screen: 'When we add the fractions and "
Margie was thinking about how the kids must have loved it in the old days. She was thinking about the fun they had.